So this girl that was like my best friend started being like super fake to me so I was like no I don't need this in my life. So I'm not friends with her any mordants I just found out she is dating the guy I had a crush I witch she knew about and I'm pretty sure she only dates him to make me mad and his ex girlfriend but I don't know so I'm like severely angry! and I just dot know what to do so could I get some advice?