My older brother (25 M) is a very flirtatious and outgoing sort of person, everyone likes him. I have a best friend (20 F) and he has made it pretty clear that he’s attracted to her and says things about her to piss me off. (Things like how she’s hot n this n that). My best friend, is fully aware of this, and is also fully aware that my older brother has not been the best guy to me (just irresponsible and unreliable). I saw my best friend the other week and she had brought up that my older brother had asked her out to eat (he has a whole girlfriend) and she accepted. I’ve talked to her previously that I do not like them being close and it makes me uncomfortable and she said she wouldn’t do anything like that again yet she accepted and didn’t even tell me until after the fact. I had not heard from my brother in over a month and she was telling me all about the stuff he said like how his relationship isn’t going so well. This has REALLY annoyed me, considering she is fully aware of how he feels, and I how I feel about it. I thought it would just be common sense to not do that with ur best friends sibling??? I’m highly considering cutting her off as I have already expressed how I don’t like her doing that kind of thing and she did it again. AITA???