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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

My DS cheated on his girlfriend in my home

1000 replies

ErsBears · 03/01/2026 02:44

Hi, so DH and I were away staying with friends over new year, DS’s girlfriend had gone back to her home country to see her family and DS couldn’t as he had to work so I asked if he would be okay staying at ours to watch the dog, he said sure.
DH and I came home early as one of our friends has fallen ill and wanted some space, we went for dinner first then got a train and cab home at about 11:30pm. I didn’t pre warn DS as I didn’t really see the need to. When we got home he was in his room so I didn’t bother him but then DH realised we had no milk, nothing for breakfast and DH had a headache so needed some paracetamol. We have a 24 hour shop within driving distance and both DH and I had been drinking so I went to ask DS if he would mind popping out. I could see his light was on and hear the tv so knew he was awake. When I knocked on the door the first thing I heard was a girls voice saying “is that your mum”. He came the door in his boxers and asked why we were back early, I explained he told me he’d been drinking so couldn’t. Fine. I asked if his girlfriend was back early (I knew it wasn’t her as his girlfriend has a very identifying accent and it was clearly an English accent I heard).

Anyway he admitted he had someone else over, I told him that she had to leave, he booked her a cab and she left. I made it clear to him that either he tells his girlfriend tomorrow or as soon as she is back or I will tell her, I do not condone cheating. He tried to tell me he didn’t sleep with her but when I pointed out he was only in boxers he admitted he was lying. He said he would tell her but they have a holiday booked for next week (she gets back on Sunday, they fly out on Monday).

For context he’s 28, his girlfriend is 25 and they’ve been together for 2 years, they don’t live together but she owns a flat and he was meant to be moving in this year.

AIBU to be bloody raging and so disappointed that this is the man I raised? I am disgusted that he cheated and I think he needs to tell her before the holiday. We are meant to be picking them up on Monday morning to take them to the airport as it’s an early flight. I don’t think I can sit with her in the car and send her off on holiday with him knowing what he has done!

OP posts:
HelloDenise · 03/01/2026 16:22

So many people on this thread have no integrity at all.

Uricon2 · 03/01/2026 16:22

JHound · 03/01/2026 16:12

As we see here - these are the women raising the men that women complain about. All morality goes out the window when it comes to their “Precious Son”.

Yes

Random female poster. " My marriage is over I think, we haven't had sex in 729573 years, his decision. He's always on Only Fans. I've become emotionally close to a colleague and feel very guilty"

Response " Tell your poor DH at once and do a shame walk, you Jezebel, there is never an excuse for cheating (&c, &c)"

OP's son's situation outlined clearly.

Response (from some) " It's none of your business that he cheated on his GF, keep your nose out, don't betray his trust , you should have warned him you were returning (to your own home), perhaps his GF's after his money/cheating (&c, &c) "

Total batshittery.

FOJN · 03/01/2026 16:22

Differentforgirls · 03/01/2026 16:14

Always a woman’s fault eh?

Always, especially when a man in a 2 year relationship decides to use his parents house for a hook up whilst his girlfriend is out of the country. All upset arising from this event will be because his mum thinks his behaviour is immoral, she doesn't like randoms she don't know in her house and his girlfriend isn't very understanding that she left the country and he has "needs".

Women just make men's lives so unbearably hard. We should all take a moment to reflect and contemplate how we can make amends for having the temerity to have standards. I am shamed and repentant.

PatsyJane · 03/01/2026 16:23

Differentforgirls · 03/01/2026 16:14

Always a woman’s fault eh?

Id have said the same to man actually. And if it had been my daughter in the bedroom with a man who’s voice I didn’t recognize I’d have done the same. He was looking after the dogs as a favour to his parentsI’m not sure why they didn’t text to say they ‘d be back early. Now they know they know so yes it makes things very difficult. For all they know their son has an open relationship with his girlfriend but is he expected to explain that too?

JHound · 03/01/2026 16:23

Rewis · 03/01/2026 15:44

People would really be happy if their MIL knew (not only knew, but witnessed) about their husbands affair and their tendency to download tinder whenever you went to visit your family? Interesting.

It is one thing to give advice that you're worried how it wil affect op's relationship with her son, but straight up say that none of your business and she should respect the obviously very valid reasons to cheat.

Got to admit. It has been a few weeks since I've gotten a good whiplash in MN.

BoyMoms.

They will complain about behaviour in their husbands while supporting the same behaviour in their sons

I get people who are concerned that telling the GF may ruin the relationship with her son. But the ones berating her for not tolerating it or telling her to simply butt out and let him cheat on his girlfriend in peace are mindbogggling.

Especially when, as you state, they would be infuriated if they learned their MIL turned a blind eye to their husbands infidelity and his use of dating apps to find cheating partners.

ErsBears · 03/01/2026 16:25

PatsyJane · 03/01/2026 16:23

Id have said the same to man actually. And if it had been my daughter in the bedroom with a man who’s voice I didn’t recognize I’d have done the same. He was looking after the dogs as a favour to his parentsI’m not sure why they didn’t text to say they ‘d be back early. Now they know they know so yes it makes things very difficult. For all they know their son has an open relationship with his girlfriend but is he expected to explain that too?

If he was in an open relationship, what would the issue be with me telling his girlfriend or his initial hesitance to do it himself? Surely it would be nothing she didn’t already know and cause no issues.

OP posts:
JHound · 03/01/2026 16:27

PatsyJane · 03/01/2026 16:23

Id have said the same to man actually. And if it had been my daughter in the bedroom with a man who’s voice I didn’t recognize I’d have done the same. He was looking after the dogs as a favour to his parentsI’m not sure why they didn’t text to say they ‘d be back early. Now they know they know so yes it makes things very difficult. For all they know their son has an open relationship with his girlfriend but is he expected to explain that too?

It’s their house why so they need to text to say they are back early.

Your are of the bonkers mindset that catching somebody cheating is worse than cheating. It’s good he was caught otherwise the poor girlfriend would continue to have her health put at risk. I can only assume you regularly cheat on your partner.

JHound · 03/01/2026 16:27

Venicelagoon · 03/01/2026 15:48

I did point out that the young man is a liar and a cheat but it is a fact that men have sex at the drop of a hat. What he should have done is to have thought of his relationship with his girlfriend of 2 years and resisted temptation but the fact remains he didnt want to resist.

Only the terrible ones. Not all men are cheaters

Differentforgirls · 03/01/2026 16:30

CutePixieGirl · 03/01/2026 16:20

It’s evident that the whole family lacks respect.

No accusation required, it was written in the OP.

She said she had eaten a meal and had a drink. Not that she was drunk. Seriously, you have no respect.

Wisperley · 03/01/2026 16:30

I think I would probably have messaged to say I was coming home early tbh. Not because I needed to, but because he could have been dancing naked in the sitting room, or sitting on the loo with the door open... anything like that. It's just polite. I know it's your own home OP, but still, I wouldn't want to embarrass anyone, let alone my own child. But you have now.

JHound · 03/01/2026 16:30

EatYourDamnPie · 03/01/2026 15:51

No one threw themselves at him(not that that is an excuse). He deliberately downloaded the app and made an account. He chatted with at least one woman there. He waited until the gf was out of the country and he was in a “safe” space (not the flat he shares with her friends). Then he deliberately invited that woman over and had sex with her. Every single act was a conscious, deliberate step , not “temptation “.

This. I could may sympathise with a stupid drunken mistake.

But he planned and went out of his way to cheat. He needs to be single.

PatsyJane · 03/01/2026 16:32

ErsBears · 03/01/2026 16:11

I don’t announce to my DH if I’m coming home early either, it’s my house I can arrive and leave whenever I like without having to let anyone else know. I’m sure my son doesn’t let his flat mates know every time he is leaving or coming home.

We also didn’t start drinking when we got home, we went for a meal and drank then, I didn’t know we were out of milk etc. as I hadn’t been home in several days, DS managed to finish 2 litres of milk and all the cereal. I couldn’t have imagined he’d have a stranger over. I do not want strangers in my home, it’s my home! I only knocked as I could hear the tv and see the light was on under the door and he usually loves an excuse to go to the supermarket at night.

I also wasn’t going to turn a blind eye to a stranger in my home as that’s not okay, you don’t bring extra guests to someone’s house without checking with the owner of the home, it’s common decency.

Oh well we’re all different but I wouldn’t dream of coming back a day early at 11.30pm without warning the person looking after my dog ,son or not. I know it’s my house but to me its just common decency. You could have frightened the life out of him for a start.

PatsyJane · 03/01/2026 16:33

Wisperley · 03/01/2026 16:30

I think I would probably have messaged to say I was coming home early tbh. Not because I needed to, but because he could have been dancing naked in the sitting room, or sitting on the loo with the door open... anything like that. It's just polite. I know it's your own home OP, but still, I wouldn't want to embarrass anyone, let alone my own child. But you have now.

Exactly

thepariscrimefiles · 03/01/2026 16:34

Wisperley · 03/01/2026 16:30

I think I would probably have messaged to say I was coming home early tbh. Not because I needed to, but because he could have been dancing naked in the sitting room, or sitting on the loo with the door open... anything like that. It's just polite. I know it's your own home OP, but still, I wouldn't want to embarrass anyone, let alone my own child. But you have now.

He's embarrassed himself.

Differentforgirls · 03/01/2026 16:34

PatsyJane · 03/01/2026 16:23

Id have said the same to man actually. And if it had been my daughter in the bedroom with a man who’s voice I didn’t recognize I’d have done the same. He was looking after the dogs as a favour to his parentsI’m not sure why they didn’t text to say they ‘d be back early. Now they know they know so yes it makes things very difficult. For all they know their son has an open relationship with his girlfriend but is he expected to explain that too?

Your personal low standards have no bearing on this situation.

KitWyn · 03/01/2026 16:34

PatsyJane · 03/01/2026 16:23

Id have said the same to man actually. And if it had been my daughter in the bedroom with a man who’s voice I didn’t recognize I’d have done the same. He was looking after the dogs as a favour to his parentsI’m not sure why they didn’t text to say they ‘d be back early. Now they know they know so yes it makes things very difficult. For all they know their son has an open relationship with his girlfriend but is he expected to explain that too?

If he had an open relationship with his girlfriend of 2 years he would have said that.

A bit embarrassing to tell his mum, yes, of course. But much, much less embarrassing than her thinking her DS is a cheating slimebag, who hides his sex-app shags in her home. Which he no longer lives in.

I'd be furious at being placed in this position.

If DS is unhappy with his girlfriend then he should talk to her, and break up if necessary. There is never an acceptable excuse for cheating. Just end things first, and then he can do whatever he wants.

reversingdumptruckwithnotyreson · 03/01/2026 16:35

I don’t understand why anyone is trying to make this about OP announcing she was coming home (to HER home no less!!) early or not.

If he hadn’t been up to extremely bad, shitty behaviour at the grown age of 28 this wouldn’t have been an issue.

JHound · 03/01/2026 16:35

shuggles · 03/01/2026 16:16

I'm in disbelief at the responses, and the number of people who are completely indifferent to a man having multiple sexual partners.

So is it actually an issue for a man to have multiple sexual partners? Does it suddenly become OK if the man is a relative, such as a son?

Perhaps cheating men are not the issue after all; the issue is the people who defend them.

A lot of women forget all morality when it comes to their Precious Son.

Differentforgirls · 03/01/2026 16:36

Wisperley · 03/01/2026 16:30

I think I would probably have messaged to say I was coming home early tbh. Not because I needed to, but because he could have been dancing naked in the sitting room, or sitting on the loo with the door open... anything like that. It's just polite. I know it's your own home OP, but still, I wouldn't want to embarrass anyone, let alone my own child. But you have now.

She’s embarrassed him! Jesus.

JHound · 03/01/2026 16:36

CutePixieGirl · 03/01/2026 16:20

It’s evident that the whole family lacks respect.

No accusation required, it was written in the OP.

What respect does the mom lack?!

Bordeuxkitchen · 03/01/2026 16:37

JHound · 03/01/2026 16:30

This. I could may sympathise with a stupid drunken mistake.

But he planned and went out of his way to cheat. He needs to be single.

Agree, because he apparently was also simultaneously planning to propose?
I mean…..WTAF? I want to marry you but also shag randoms on a dating app at my mums house???

As an aside, I do not think this kind of behaviour is uncommon. I think a lot of men can believe they love someone and want to marry them and also shag other people at the same time. Obviously, the future wife doesn’t have the same rights, but they sort of…..gloss over that bit, compartmentalise and crack on. It’s awful.

MNLurker1345 · 03/01/2026 16:37

CutePixieGirl · 03/01/2026 14:24

You should have informed him that you were returning early. That’s basic good manners.

Invading his privacy because you were too drunk to remember to get your own milk is just pathetic and rude.

You and your husband sound embarrassing and childish.

‘Raging’ at him is not going to make any difference to how he feels about what’s he’s done. If you have raised a decent person, he will already be feeling very bad, anxious and conflicted and as a parent, you should know this.

This should have been a quick, calm and quiet conversation between you and your son.

Are you having a laugh? Are you just trying to be controversial for the sake of it? Are you on the wrong thread?

Surely you don’t really mean that do
you?

Wow, the cloak of anonymity that SM provides gives you carte blanche to spew any rubbish you want! Go for it!

JHound · 03/01/2026 16:39

Uricon2 · 03/01/2026 16:22

Yes

Random female poster. " My marriage is over I think, we haven't had sex in 729573 years, his decision. He's always on Only Fans. I've become emotionally close to a colleague and feel very guilty"

Response " Tell your poor DH at once and do a shame walk, you Jezebel, there is never an excuse for cheating (&c, &c)"

OP's son's situation outlined clearly.

Response (from some) " It's none of your business that he cheated on his GF, keep your nose out, don't betray his trust , you should have warned him you were returning (to your own home), perhaps his GF's after his money/cheating (&c, &c) "

Total batshittery.

It’s weird how she is bad for returning early to her OWN HOME but be is not bad for bringing a random one night stand over to his parents house.

People saying his relationships are none of his parents business. He made it their business when he invited his ONS over.

Differentforgirls · 03/01/2026 16:40

The amount of women on this thread who have very low standards and seem to only know weirdos who cheat is appalling.

Get some self respect!

Factsoverfiction · 03/01/2026 16:41

reversingdumptruckwithnotyreson · 03/01/2026 16:35

I don’t understand why anyone is trying to make this about OP announcing she was coming home (to HER home no less!!) early or not.

If he hadn’t been up to extremely bad, shitty behaviour at the grown age of 28 this wouldn’t have been an issue.

I think blaming the mum for something helps them come to terms with not holding their sons accountable for being cheats.

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