WIBTAH to ask my girlfriend to not hangout with someone she used to like.

I (m16) have a girlfriend (f16) who is bisexual and has a friend (f16) who’s is also bisexual that has been in her life for a year or two before she knew me. She previously had feeling for this friend and even once described it as being in love in a genuine way and was talking to her and wanted her right up until we were talking for a while and she moved on to me and got over her. They also have an ongoing joke where they pretend to be married and I don’t usually mind that kind of joke with friends but I know that she was doing it while she actually liked her and even was excited about that joke with her but never told her.

This friend is also very rude to me probably just for fun but the two of us don’t really get along. So she is going to be hanging out with this friend this week and I tried to not let it bother me but it just us and I can’t help it and I can’t go to any friends cause she isn’t out a lgbt yet so idk how to deal with it so I wanna bring it up to her that it bothers me but idk if that would be wrong or not.