Why do my girlfriends always start liking me, or try to hook up w/me it’s weird? I’m also straight.

So this girl has a boyfriend and a 1 year old child, and she keeps trying to make passes at me. I don’t want to have issues with her boyfriend since I’m always hanging out with them but she even lied to him to make him think I was taking her out for Valentine’s Day. Then told me he got jealous af and mad. I dont want nobody boyfriend trying to hurt me over their ugly gf. I’m just a nice friend and I like to treat my friends good but I would never go that way with her, for one she’s not my type even if I was, and I like men. Yesterday she claimed to miss read my text and tried to flirt with me but I responded with a question mark, whats a nice way to call her out for this. I told her stuff like this bothers me because everytime I try to make female friends they start the delusions. These girls don’t know what a good friend is if you take them to movies, out to eat as friends, or just to get out the house they think you want to sleep with them. I actually don’t even know if I want to continue the friendship because I’m tired of always paying for everything, I did it the first few times because I was being nice but maybe I need to stop because these girls think I want to pay they bills and be with them. Also I’m a attractive blk woman that’s just tired of everyone sexualizing me unprovoked even straight female friends do this to me.