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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

Aibu to think boyfriend was with his brothers girlfriend?

33 replies

erinS93 · 26/08/2026 10:20

So does anyone else find this odd? I’ve been with my partner a year. And I haven’t met his brother. He told me a story of how they randomly stopped speakin and don’t even have each other on any social media anymore and how they where really really close etc. my boyfriend told me he is nearly sure his brother slept with his ex wife. (My boyfriend and his ex wife have been split for 3 years) he told me how they used to go out all the time and there was one time he seen a picture of his ex’s boobs in his brothers phone. So he said she obviously sent the brother that. But then I’m over thinking that the reason that they don’t speak is something to do with my boyfriend sleeping with his brothers girlfriend? He maybe done it on badness if he thinks he was with his ex wife. Aibu to overthink this? Aibu

OP posts:
thisismeithinkorisit · 26/08/2026 11:04

What is it about your brother than makes you think he's a liar and a cheat?

GladBiscuit · 26/08/2026 10:50

So you think he is deflecting because he was the one who actually did the dirty, à la Bridget Jones? That’s quite a reach but you clearly don’t trust your boyfriend to be honest, do you trust him in other areas?

NearlyNewNonny · 26/08/2026 10:41

Isn't it more likely the brother slept with his wife? There's nothing there to say your partner slept with his GF.

Wherethedogsits · 26/08/2026 10:41

Your boyfriends brother maybe slept with your boyfriends now ex wife and you think that your boyfriend slept with his brothers girlfriend as retaliation?

Sounds exciting!

Mycatmax · 26/08/2026 10:37

Eh?

SunnyRedSnail · 26/08/2026 10:37

Does it matter?

BMW58 · 26/08/2026 10:36

Why do you think he's done that?

Thirteenblackcats · 26/08/2026 10:35

without any evidence im not sure how you could reach that conclusion. You could always ask his brother though