Here's a thing I don't understand.

My friend's son is having a stag do (translation for furriners: "bachelor party") and his brothers are invited, but his sister isn't. I said: why not invite her too? It's unconventional to invite women, but I've been on a hen night (furriners: no idea - work it out for yourselves) and it was fine. But the reply was that she fancies one of the blokes who will be there, and they can't get together because if they later split up it will be awkward.

Is that a thing? Once you've ended a relationship with someone you must never see them again? Wow! Now I don't have much experience here. I've been in the same relationship most of my life, but if I saw someone from before that, I'd be happy to sit and have a catch up. I suppose that if it ended dramatically then it might be a problem, but if you think that your sister and your friend couldn't be civilised about something like that, you've got a bad opinion of them, haven't you?