relationship question

any of you guys have a girl who slept with one of your friends in the past?..It's a shitty situation, at least i think so. See I used to chill with this kid Chris...after we graduated we kind of stopped chillin..I start seeing this girl and she mentioned him ect...well now it seems liek i run into him all the time and he always wants to chill..I know im wrong for wanting to hit him everytime i see him but it just sucks cause he's a pretty cool kid..into cars and shit just like me...but its really awkward...anyone else feel me on this?