Dunno what to do brahs. Broke up with this girl about a year back, but it ended with a lot of unresolved stuff. Still cared about her a ton but we didn't talk for months even though she tried to contact me a few times. I pretty much got over it, but recently she started messaging my friend and he's gonna try(most likely succeed) to -blam!- her. It would be selfish of me to tell him not to because she's not even mine right?? Even though I thought I was over her I feel mad & jealous as fuck, which is so selfish of me,right? She had a boyfriend or two since then and so have I, but I feel kinda betrayed. How do I get over this feeling?