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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

To blow friend out for cheating on husband?

65 replies

Larose123 · 16/12/2025 21:20

I've been wondering this for a while. If you had a friend/ friend of a friend who cheats on her husband and sh*gs anyone she can get her hands on, would you blow her cover?
I cross paths with this man once a week, I've never spoken to him though.
Is the moral thing to stay out of it, or is the moral thing to let the man know?

I was cheated on by my ex husband, I always wonder why no one ever told me about him. Clearly everyone in his circle knew.

OP posts:
Roobarbtwo · 17/12/2025 12:12

TheIceBear · 17/12/2025 11:32

I wouldn’t tell her husband but I actually don’t think I could remain friends with someone like this. a once off is one thing but to do it continuously shows poor character and dishonesty. If she is doing that to him there is a high chance she would backstab you in some way as well

She's a friend of a friend apparently

I personally don't know why someone would be invested in anonymously telling someone they don't know that their partner is cheating - particularly when they aren't friends with the person concern

What have they got to gain from this - a moment of satisfaction of telling someone what's going on. And they'll need to hide from friends that they were the person who told him

Roobarbtwo · 17/12/2025 12:14

If you do want to do this - tell him directly. Don't hide behind an anon letter or email. I think you've got unresolved issues from being cheated on yourself - but that's not a reason to do this - why don't her friends do something? People who are closer. Why is this on you to say something

And as people have said - unless you have evidence - she'll deny it and it will rebound back on you

Quondam · 17/12/2025 12:17

Larose123 · 16/12/2025 21:42

@Thisisnotmyid the most evidence I have is having seen her kissing other ppl with my own eyes, my friend saw her having s** and the other person I know she slept I can investigate more.

So it's total hearsay, apart from you seeing her kissing someone other than her husband?

TheIceBear · 17/12/2025 12:19

Roobarbtwo · 17/12/2025 12:12

She's a friend of a friend apparently

I personally don't know why someone would be invested in anonymously telling someone they don't know that their partner is cheating - particularly when they aren't friends with the person concern

What have they got to gain from this - a moment of satisfaction of telling someone what's going on. And they'll need to hide from friends that they were the person who told him

A friend of a friend . I agree there is zero chance I would get involved. seriously ?? Like unfortunately this type of thing happens you could just open an account on Ashley Maddison or the like and start reporting everyone there who cheats it would just be neverending.

MrsSkylerWhite · 17/12/2025 12:19

Upthenorth · 16/12/2025 21:22

I would stay out of it and not socialise with someone who thinks that’s ok.

Edited

This.

BadgernTheGarden · 17/12/2025 12:20

How do you not know him if he's your friends partner? It would be really odd to confront a stranger to tell them their partner is cheating.

Roobarbtwo · 17/12/2025 12:20

BadgernTheGarden · 17/12/2025 12:20

How do you not know him if he's your friends partner? It would be really odd to confront a stranger to tell them their partner is cheating.

It's a friend of a friend

OonaStubbs · 17/12/2025 12:23

Stay out of it. It's nobodies business but their own. Maybe she has a high sex drive and he is willing to turn a blind eye to her infidelities?

Schoolregret · 17/12/2025 12:25

None of your business.

Ionlymakejokestodistractmyself · 17/12/2025 12:28

How do you know they don't have an open relationship?

How do you know they don't have a "don't ask, don't tell" approach to infidelity?

How do you know she isn't getting revenge for his multiple previous infidelities?

How do you know he's not actually gay and she's his beard?

You don't presumably, so stay out of it.

Eudaimonia11 · 17/12/2025 12:28

I would stay out of it for the most part but I would try to say something to the husband that wouldn’t outright tell him but may make him think - a small offhand comment here and there. Something like “how was the film last night?” Or “where did you both end up going last night?” - something where if friend questioned me, I could feign innocence and say I assumed she’d gone with her husband and I was just making normal small talk.

I would struggle to remain friends with someone who cheats on their partner, especially if I saw the partner regularly.

Gwenhwyfar · 17/12/2025 12:32

ZoggyStirdust · 16/12/2025 21:50

But this is mumsnet, where “it’s none of your business” if a woman is cheating…

Well, it isn't any of your business unless it affects you somehow. Same if a man is cheating.

Roobarbtwo · 17/12/2025 12:40

Eudaimonia11 · 17/12/2025 12:28

I would stay out of it for the most part but I would try to say something to the husband that wouldn’t outright tell him but may make him think - a small offhand comment here and there. Something like “how was the film last night?” Or “where did you both end up going last night?” - something where if friend questioned me, I could feign innocence and say I assumed she’d gone with her husband and I was just making normal small talk.

I would struggle to remain friends with someone who cheats on their partner, especially if I saw the partner regularly.

That's really not the way to do it. The OP doesn't know this man. They've never spoken. So she's going to approach him and ask him how the film he went to with his partner was? A complete stranger?

MorrisZapp · 17/12/2025 14:53

Larose123 · 16/12/2025 21:38

@Cookiecrumblepie exactly!! You would tell on people that do other horrible stuff like SA, stealing, abuse, neglect. How is cheating more acceptable?

How can I do it anonymously?

Those things are criminal. Cheating is personal.

surreygirly · 17/12/2025 14:54

It is not your business
You have n o idea what goes on behind her closed doors
If what she does is not ok with you just move on
Do not begave like the morality police in Afghanistan

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