He didnt deserve it...

This girl I know broke up with one of my best guy vrienden for my crush(again) I only know because a) her sister told mine that it would happen and b) cause my friend told me right away that they broke up. The problem is that my friend refuses to believe that she will go back to my crush despite all the complaining she does about him. I kept tellin him that she isn't worth it and that she will crawl back, but he doesn't think so because of the crap she talks about him. I should stay out? Uh not so fast: she is a total jerk to everyone, wears too much makeup, definitely been around the block(she's dated half the guys at my school and idk how many at hers) shes a sleaze bag she thinks she so good and TOO good for anyone. But the point is my crush was actually starting to gain interest in me and she comes along in her Steve Maddens and screws it up and to make matters worse she's moving in right volgende door to my crush! Idk what to do to get her out of my way!!!