Brother moving in with woman who had affair with friend

[Berline]

My brother has begun a relationship with the woman that his married best friend cheated with.
She's crazy about him, he does LIKE her and they seem to compensate for each other's weaknesses but I can't help but feel he is making a huge error here.

Mainly because he's not as keen on her as she him and that she is the sort of person who'll cheat with a married man with the added flaw of that man being his best friend!

This seems utterly crazy to me and I've tried to diplomatically put this to him but he's of the opinion that 'they wouldn't do it to him!'

I think he's making a huge error here so I put it to fellow mner's: AIBU?

I know that it's his life but the way he talks it's as if I'M the one who 's unreasonable.
I've woke up this morning and still smarting from our telephone conversation about this last night.
Part vent I suppose as he's an adult etc but I care about him.

I think you need to keep out of this, it's his relationship, you've told him your opinion now let it go. He's an adult and he can make decisions about his relationship himself including who he wants to be with.

Also, his best friend was the married one, while if she knew it does say something about her, she wasn't the cheat. You can't blame her for his friends choices, if his relationship broke down he has himself to blame.

How do you feel about him maintaining the relationship with his best friend, the guy who cheated on his wife?

Surely it was his best friend that cheated not her? I think your brother could be making a mistake too, but that is if it is accurate that he is moving in with somebody that he merely likes. But it is his choice and I don’t think you should tell him what to do.

He might be making a mistake, but it's his mistake to make.

I think he should cut BOTH of them out of his life but this is of more urgency as he's moving in with the woman in the affair.
Yes, she knew he was married. The affair started when his wife had just given birth. It was well known at the time. His wife chose to stick with him.

He's just met her but he's moving in with her already?

Doesn't sound great tbh

To to sound rude OP but - not your circus, not your monkeys.

It is natural to feel protective over your siblings; I would have the same reservations as you! But unfortunately you need to keep out of this.

Just be there for your bro if and when he needs you.

I completely get why you are worried. But you've said what you wanted to say, so now you need to leave it be. You can't force someone to see things the way you do, so there is nothing more you can do at this point.

Unfortunately it's not your life! Sounds like a big mistake but it's his to make. You will just damage your relationship by pushing this further. It's fine to let him know you disagree but don't argue, and let him know you are them for him in case anything goes wrong. You can't control other peoples lives.

Not your car crash, unfortunately some thing have to be experienced for the lesson to be learnt

OP, keep your judgemental opinions to yourself. Your brother is an adult and can manage his friendships and relationships without you.