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Relationships

Mumsnet has not checked the qualifications of anyone posting here. If you need help urgently or expert advice, please see our domestic violence webguide and/or relationships webguide. Many Mumsnetters experiencing domestic abuse have found this thread helpful: Listen up, everybody

Boyfriend is upset I can't trust he won't cheat

158 replies

Trustisanissue · 17/02/2026 17:08

I was married for 20 years. That ended because XH cheated. I forgave him the first time I discovered his cheating 12 years in. I didn't forgive him the second time I found him cheating again. XH was lovely... Until he wasn't.

I was with the next man for 3 years. He cheated on me too. That was really hard to process, as he knew how deeply XHs cheating had broken me. He was lovely... Until he wasn't.

I've been with my current boyfriend 18 months. We've been friends for 10 years. He got upset this morning when I told him I couldn't trust that he won't cheat in the future. He said things like "it's just not me. I don't do that. You know me well enough by now to know I couldn't do that, it's not in my nature"

He found my repeated reply of "they said that too" upsetting. He finds it hard to hear that my past experiences make me look at him this way as he tells me he's not a cheating person.

The other two men said that too.

I trusted them. And I trust him now.

We both understand the others perspective, and left it this morning with a sad conclusion of "thank you for listening"

Any tips on helping us in this please?

OP posts:
IDasIX · 17/02/2026 20:50

I was cheated on in a long-term relationship. Proper taking the piss, making an absolute fool of me cheating.

I made a very active decision, going into my current long-term relationship a few years later, that if I didn’t trust him not to do the same then there was no point in being together at all. It’s the only healthy way, for both parties.

gamerchick · 17/02/2026 20:52

You're punishing him with your past OP. Its not fair.

You're not ready for a relationship. You need to let him go and spend time by yourself to heal.

Strngerthings · 17/02/2026 20:54

gamerchick · 17/02/2026 20:52

You're punishing him with your past OP. Its not fair.

You're not ready for a relationship. You need to let him go and spend time by yourself to heal.

considering how her previous partners said they would not cheat and then did etc ? how is it ops fault, this one too could be the same as the others

IdentifyingAsAWoollyMammoth · 17/02/2026 21:17

Strngerthings · 17/02/2026 20:54

considering how her previous partners said they would not cheat and then did etc ? how is it ops fault, this one too could be the same as the others

And it's not her boyfriend's fault either, but he's the one verbally on the receiving end of her mistrust.

Strngerthings · 17/02/2026 21:18

IdentifyingAsAWoollyMammoth · 17/02/2026 21:17

And it's not her boyfriend's fault either, but he's the one verbally on the receiving end of her mistrust.

true, i guess then its 50/50 but then if he did, does the op get to go i was right etc

OnlyMabelInTheBuilding · 17/02/2026 21:19

He’s done nothing wrong. It doesn’t matter what has happened in your past; for him it’s irrelevant.

You need to sort yourself out. These are not his problems to sort.

1000StrawberryLollies · 17/02/2026 21:28

Trustisanissue · 17/02/2026 18:22

This is where I'm at.

I do trust him. He's a lovely man.

This morning was a one off conversation prompted by an anonymous valentine's card he received in the post to his work. It hasn't prompted me to worry in the slightest that he is cheating, but it did result in our conversation.

I've never, and would never, trawl his phone or try to tell him who he can/can't see.

But you cannot 100% trust a person not to cheat. And my experience has shown me that.

But 'I don't trust 100% that you would be incapable of cheating' is not something that you need to say to a partner. You decide in youf own mind whether you trust them as much as you can trust someone. Or you don't, and so you end the relationship. What you don't do is unnecessarily and undeservedly dump your previous relationship baggage on them and thereby doom the relationship.

exhaustDAD · 17/02/2026 21:31

If we like thinking about hypotheticals so much, here's one for you of a potential future:
Well, it was over with one ex because he cheated. It was over with the second ex because he cheated. What about the third? Well, I kept frustrating him because the first two cheated and he left.

Do we see the irony of it?

Isthismykarma · 17/02/2026 21:45

I have two exes who cheated. I trust my current partner completely and I genuinely don’t think he would do anything like that to me.
My theory on it all is that I’m clearly rubbish at spotting out the rotten ones, and if they want to get away with it they will! I can’t control how people treat me, I can only control how I make my judgements and how I treat others. I built up the trust slowly with current parter and once it was there I thought fuck it and dove in. I’ve done the best I can to pick a good one and if it doesn’t turn out that way it would be no reflection on me.
He knows all of this and kind of agrees to an extent. He is happy that within our relationship we are both completely reassured, but from my lived experience and I suppose when I try to think from my head over heart I feel that I could never rule it out. He isn’t offended and our relationship is great!

gamerchick · 17/02/2026 21:49

Strngerthings · 17/02/2026 20:54

considering how her previous partners said they would not cheat and then did etc ? how is it ops fault, this one too could be the same as the others

He hasn't done anything wrong. Why should he put up with being punished for something he hasn't done?

Trustisanissue · 17/02/2026 21:51

exhaustDAD · 17/02/2026 20:23

Absolutely not one person tried to disregard the sheer statistics of the other person not cheating. But here's the kicker: Nobody feels the need to, either. For healthy, well-adjusted adults, who live in reality instead of "what-ifs" and hypothetical scenarios it is enough. If you are unable to handle that, relationships are not for you going forward. And yes, you can say 100% certainty that you won't cheat, but let's not confuse proving something that you are in 100% control vs something that you will never be in 100% control. Problem is, you are not willing to accept this. You don't seem to see how your behaviour is unreasonable, and not fit for an adult relationship. You ask for how to steer the argument around it, and not even attempting to maybe get to a better place mentally where the argument doesn't even happen. The fact that you are so against doing some mental self-care is also telling. You do not think it is wrong what you are doing to him. And as long as this is the case, you have no chance of sorting this.. And he will not put up with this for long... or at least shouldn't.

Where do you draw the line @Trustisanissue ? Going outside your door in full armour in case a meteorite falls from the sky? it happened before, and there's never a 100% chance of it not happening... Please think of this example carefully. It has a lot of parallel with what you are doing.

I can give you a more meta one... Once you and him are done, does the fact that you were so unreasonable mean that he should expect it from any future partner? You know the answer to that, don't you?

Edited

But I don't understand how I can get to a better place mentally on this one...

Anyone in a relationship has the potential to cheat. That's a fact.

Acknowledging something could happen in the future is not " living in what ifs or hypothetical scenarios". That's a fact.

It's been one conversation. That's a fact.

There's been no argument. That's a fact.

I'm not doing anything to him. That's a fact.

I've not said I am "so against doing some mental self-care." Believing that everyone in the world may cheat doesn't need mental self care on the issue. That's a fact.

People in relationships should speak with openness and honesty. That's a fact.

Your example has no parallel with this whatsoever. That's a fact!

Only time will tell if he feels I was "so unreasonable". From the way he's been today, I don't think he does. He took it for the discussion that it was.

OP posts:
Noitdoesntwork · 17/02/2026 21:57

I always find the “my husband would never” responses quite fascinating because the truth is, we can never actually 100% know, despite what we would like to believe.
That said, I do trust my DH, but the fact is, I trust myself more, to deal with that should it ever arise. I don’t worry about it or feel the need to tell him I’ll never be totally convinced he won’t do something awful, because I trust myself, if that makes sense?

Trustisanissue · 17/02/2026 21:57

Isthismykarma · 17/02/2026 21:45

I have two exes who cheated. I trust my current partner completely and I genuinely don’t think he would do anything like that to me.
My theory on it all is that I’m clearly rubbish at spotting out the rotten ones, and if they want to get away with it they will! I can’t control how people treat me, I can only control how I make my judgements and how I treat others. I built up the trust slowly with current parter and once it was there I thought fuck it and dove in. I’ve done the best I can to pick a good one and if it doesn’t turn out that way it would be no reflection on me.
He knows all of this and kind of agrees to an extent. He is happy that within our relationship we are both completely reassured, but from my lived experience and I suppose when I try to think from my head over heart I feel that I could never rule it out. He isn’t offended and our relationship is great!

That's good to hear, thank you.

I don't think he was offended today. Just sad that when push came to shove, I believed he could cheat on me.

I genuinely don't think he would. But I acknowledge he could. And he was sad to hear that.

But, like you say, you can't rule it out. Particularly when you've been cheated on twice by people who you didn't believe possible of cheating.

OP posts:
Strngerthings · 17/02/2026 22:03

exhaustDAD · 17/02/2026 21:31

If we like thinking about hypotheticals so much, here's one for you of a potential future:
Well, it was over with one ex because he cheated. It was over with the second ex because he cheated. What about the third? Well, I kept frustrating him because the first two cheated and he left.

Do we see the irony of it?

that is the flip side of it

HowBizxarre · 17/02/2026 22:04

Mysticguru · 17/02/2026 17:09

He needs to finish with you and you need to heal.

This. If your so worried he will cheat then and the relationship ship instead of punishing him for your exes behaviour. It's actually really horrible of you

IdentifyingAsAWoollyMammoth · 17/02/2026 22:13

I'm still at a loss to know what you wanted out of this thread, OP. You say Any tips on helping us in this please? but help to achieve what? What help does he need when he's done nothing wrong and the issue is yours?

Of course he felt sad. His partner of 18 months basically said "I don't and can't ever trust you" and when he tries to assure you he wouldn't cheat (which is, frankly, all he can say) you repeatedly compared him to your cheating exes.

You really can't see how damaging that could be to this relationship with this, as you admit, lovely bloke? In his shoes, I'd be rethinking this relationship. Is that what you want?

AlwaysTheRenegade · 17/02/2026 22:31

FlowerFairyDaisy · 17/02/2026 17:14

No one can ever know if their SO might cheat on them at some point. Just like my very good friend who, while comforting me after my exH left (he cheated), assured me that the same thing would never happen to her marriage because her husband liked her cooking too much. Fast forward 3 years and he clearly went off her cooking because he cheated and they split up.

You see and hear it a lot. People believing their spouse would never cheat on them and then they do.

You have been very unfortunate that by coincidence this happened to you twice but it doesn't mean it will happen again. Try to relax and enjoy being with your SO. And decide to yourself that you will be fine living a happy single life if the relatioship does not last.

What a crap (ex?) friend!

exhaustDAD · 17/02/2026 22:35

You seem to be more delusional than it first seemed, @Trustisanissue .
A fact is something that is irrefutable because it has empirical evidence or information that supports its validity instead of theories and logics. Ex 1 cheated. That is a fact. Ex 2 cheated, that too. Anyone in a relationship has the potential to cheat. That is a fact, also. And that is pretty much the extent of your facts. While I wouldn't debate number of conversations or arguments, the sad reality is that you got one crucial statement wrong:

"I'm not doing anything to him. That's a fact." - You are. You are actively berating/frustrating a person for something he didn't do, better yet: For things someone else (factually) did. That is something. Not nothing.

Let's lean on facts that you seem to enjoy a lot. You said it yourself: "He got upset... He found it upsetting...he found it hard to hear". These are factually up there in your post. So turns out, you ARE doing something to him, well how about that...

Do you know what's making it extra sad? Just a couple of comments ago you say "you don't think he could either". And YET, you spiral into these things. Does that scream "healthy" to you? Don't know what to tell you, the vast majority of everyone who have been commenting here say that it is actually pretty horrible what you are doing, we come from different walks of life, different ages, backgrounds, sexuality and upbringing...and yet, we (vast majority) try to make you see reason, and make you understand that it is not fair to him, what you are doing, it is a form of abuse.

And yet, you are just sitting here, reading through all these comments and say stuff like - Nothing is wrong with me just for acknowledging the possibility. Yes, but you don't seem to grasp that line that separate a reasonable understanding of something vs letting it shape your behaviour and mindset.

People in a healthy relationship should be able to share, yes. But they should "upset" these things.

"Your example has no parallel with this whatsoever. That's a fact!" - Ah, but see, this is where it becomes blatantly obvious that you don't get it, you truly don't get it. Want to bet that most people here will see the parallel? The fact that you don't just supports why you are in this situation to begin with.

You said it yourself - you don't understand how to "get to a better place mentally on this one". That is why people here suggested therapy. You have such strong trust issues that you don't even see it as a problem. That is a spectacular height, let me tell you. IT IS IN YOUR USERNAME, dammit. TRUST is an issue. Well for a healthy, functioning relationship, it shouldn't. It cannot function without it.

mumofoneAloneandwell · 17/02/2026 22:40

Girl you sound hard and sad

how long have you been single in your life? Have you always been married/had relationships?

I think that you’ve got your answers but you were wrong here.

you should’ve said that you’ve given him your heart and you know that anyone can cheat, but you truly hope he doesn’t as you love him

or something like that. You shouldn’t have been so blunt and factual about it

all the best girl, I hope you get the peace you deserve x

Endofyear · 17/02/2026 22:50

IdentifyingAsAWoollyMammoth · 17/02/2026 18:41

But @Endofyear would you actually say it to your husband's face? And when he, upset, says he wouldn't do that to you, would you repeatedly say to him "they said that, too"?

It's understandable that the OP is wary but there's no need to voice it or at least in the way she did. It's incredible hurtful.

If my husband asked me outright, I would be honest about how I feel. Possibly not have been quite as blunt as OP was but we were not there to hear the nuance of the conversation and written down, it can lose some of that nuance. I think OPs partner should be considering her past experiences too and trying to understand where she's coming from. She's not saying she thinks he WILL cheat, she's saying that it's impossible to say with 100% certainty that he would never cheat, which I would agree with.

MoFadaCromulent · 17/02/2026 22:55

Mysticguru · 17/02/2026 17:09

He needs to finish with you and you need to heal.

Bingo

NannyOggAlterEgo · 17/02/2026 22:56

Arlanymor · 17/02/2026 17:50

She's known him for 10 years and dated him for 18 months - how much longer does she need to be around for him for him to 'prove' himself trustworthy? Plus it's not his job to gain her trust, he's not broken it. It's extremely exhausting being around someone who doesn't trust you - same goes for jealousy and other toxic traits that don't belong in a loving relationship. Yes you should be able to be open to your partner, yes you are entitled to doubts and insecurities, you however are not allowed to project these on to other people, particularly those who have done absolutely nothing wrong. It's exhausting and upsetting.

I agree. However lets reverse - he knew her for as long too so he was aware of her past and issues and still decided to try relationship

if you care you try to resolve issues which op i think is trying here to do too

anyway my surprise is just on all those quick straightforward comments „you dont trust partner” = „you are not fit to be in relationship go fix yourself first”

how many women here are advised not to trust fully men with money and have own money (totally agree btw) but same principle

Arlanymor · 17/02/2026 22:58

NannyOggAlterEgo · 17/02/2026 22:56

I agree. However lets reverse - he knew her for as long too so he was aware of her past and issues and still decided to try relationship

if you care you try to resolve issues which op i think is trying here to do too

anyway my surprise is just on all those quick straightforward comments „you dont trust partner” = „you are not fit to be in relationship go fix yourself first”

how many women here are advised not to trust fully men with money and have own money (totally agree btw) but same principle

Do you think she is fine to be dating when she doesn't trust (arguably) the one man who has been most steadfast in her life?

NannyOggAlterEgo · 17/02/2026 23:12

Arlanymor · 17/02/2026 22:58

Do you think she is fine to be dating when she doesn't trust (arguably) the one man who has been most steadfast in her life?

Noone is perfect.

she had one conversation after he got valentine card and she didnt argue or anything but had mature conversation where she admitted she trust him but she cant be 100% sure he will never cheat. Who could say that without sounding delusional? We can trust… but there is always chance circumstances will change. She should be able to be honest with partner

ive read here many other threads were women were unreasonable but didnt get so harsh answers.

im not saying dont work on that, im saying advising „break up, you are not fit” is quite harsh while she is clearly looking to make it better

Arlanymor · 17/02/2026 23:23

NannyOggAlterEgo · 17/02/2026 23:12

Noone is perfect.

she had one conversation after he got valentine card and she didnt argue or anything but had mature conversation where she admitted she trust him but she cant be 100% sure he will never cheat. Who could say that without sounding delusional? We can trust… but there is always chance circumstances will change. She should be able to be honest with partner

ive read here many other threads were women were unreasonable but didnt get so harsh answers.

im not saying dont work on that, im saying advising „break up, you are not fit” is quite harsh while she is clearly looking to make it better

I didn't say 'break up when not fit' using Spanish punctuation.

I said that it's horrible to be told you aren't trusted. You might think it's fine to be in a relationship where you are told you aren't trusted. But it's wrong and bad and unfair.