Friendship problems help?!!

Alright gals I need y'all advice. So back in 2014 I was head over heels for this guy name Kevin and two years have passed and I'm finally over him. Well recently I was told that my "bff" fucked him. I want to confront her about it but should I? I mean his a thing in the pass but still I think about it all the time. And also back in February 2015  I had a little crush on a this guy well in the summer of 2015 I found out my bff was talking to him. I need help should I just blow everything off or confront or what?