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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

Would you/should you tell someone their spouse had an affair?

137 replies

KeepOff · 06/03/2026 01:38

If you had absolute proof?
If it was many years ago?
What if you didn’t know them?
What if you know because the affair was with you but you didn’t know then and have only just found out?

Or is it best to leave it well alone?

OP posts:
KeepOff · 08/03/2026 22:34

MCF86 · 08/03/2026 22:10

I understand the dillema, OP.

I think I'd just send a message asking if they have separated because that's what he told you but his profile doesn't look that way.

But if I have read this right, you only just figured out when they got together by looking at her old posts? I wouldn't be admitting I trawled through 7 years of social media (side note- why did you block him 7 years ago if it was amicable at the time?)! But if she asks about who you are I would say "I was in a relationship with him years ago, but we broke up in the summer of 2019 (or whatever), so his message was unexpected" she could then work the dates out for herself

We were still in contact for some time after we split because he had stuff at mine and asked to take our cat. She actually came with him to collect the cat but she didn’t get out of the car. I blocked him out of respect for my new boyfriend because he was still texting me occasionally with things like links to songs and the odd ‘I miss you’ that I didn’t respond to.

Once I realised that he was lying about them being separated, it suddenly occurred to me that he will have lied during my relationship with him, because there’s no way he’s that a good a liar without a lot of practice. I had suspicions during our relationship about other women (he once convinced me to block a woman who apparently wanted to tell me they’d slept together and I actually did it - can’t believe that now!) but it never occurred to me that he’d been dishonest about when his relationship with his wife started. I can only see her profile pictures so I scrolled back to when she first posted one of them together and looked at the date (at least 6 weeks before we broke up) and the comments. She then changes her pic a few days later to a bunch of flowers with an ‘I love you note’ which makes me think it must have been going on longer still.

OP posts:
KeepOff · 08/03/2026 22:35

ShakeNCake · 08/03/2026 22:16

OP I'd just tell him 'please don't contact me again or I will tell your wife'. If he comes back with 'we're split' then feel free to tell the wife as you did warn him.

That is what I plan to do if he ever calls again.

OP posts:
Comedycook · 08/03/2026 22:37

I'm a big fan of minding my own business.

KeepOff · 08/03/2026 22:56

Comedycook · 08/03/2026 22:37

I'm a big fan of minding my own business.

Do you think sometimes it's imperative to ignore the ‘mind your own business’ mantra? An extreme example might be information about a crime or a safeguarding concern.

If we agree then that it is sometimes important not to mind your own business, then the question becomes, when is it right to mind your own business vs ignoring. That is the subject of this thread and the differing comments show that it is not a simple answer.

OP posts:
NoCommentingFromNowOn · 09/03/2026 02:27

Comedycook · 08/03/2026 22:37

I'm a big fan of minding my own business.

How would you feel if everyone around you minded their own business while you were having unprotected sex with someone who was having unprotected sex with someone who……and so on. Then you test positive…..for what?

SheSaidHummingbird · 09/03/2026 05:44

@KeepOff Yes, I'd want to know

Comedycook · 09/03/2026 20:38

NoCommentingFromNowOn · 09/03/2026 02:27

How would you feel if everyone around you minded their own business while you were having unprotected sex with someone who was having unprotected sex with someone who……and so on. Then you test positive…..for what?

I'm not here to solve everyone else's problems in life. Life is complicated and no one knows what's really going on in someone else's relationship. If someone found out my DH was having an affair, I'd genuinely rather not know. Ignorance is bliss.

bumptybum · 09/03/2026 20:39

PermanentTemporary · 06/03/2026 06:01

I would never choose to tell anyone. I don’t believe I would want to know myself, so I don’t take it on myself to tell others.

You wouldn’t want know????

NoCommentingFromNowOn · 09/03/2026 20:40

Comedycook · 09/03/2026 20:38

I'm not here to solve everyone else's problems in life. Life is complicated and no one knows what's really going on in someone else's relationship. If someone found out my DH was having an affair, I'd genuinely rather not know. Ignorance is bliss.

Edited

Ignorance is STI’s.

Some of them are incurable.

bumptybum · 09/03/2026 20:40

Comedycook · 09/03/2026 20:38

I'm not here to solve everyone else's problems in life. Life is complicated and no one knows what's really going on in someone else's relationship. If someone found out my DH was having an affair, I'd genuinely rather not know. Ignorance is bliss.

Edited

Sexually transmitted diseases and the risk of another child elsewhere don’t sound like bliss to me

PermanentTemporary · 09/03/2026 21:06

@bumptybum not personally, no. Dp is a very faithful type and when I’m in a relationship, I am too, but infidelity is pretty common and happens for a variety of reasons. Dp would probably tell me himself tbh, but if he didn’t, I wouldn’t thank anyone else for inserting themselves into our relationship.

Missj25 · 09/03/2026 23:47

bumptybum · 09/03/2026 20:40

Sexually transmitted diseases and the risk of another child elsewhere don’t sound like bliss to me

Same

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