How do you  get my crush to breakup with his girlfriend?
 1 Don't ask him out if he does break up with his girlfriend. 2 It'll make you look promiscuous, and he might be on the rebound and accept even if he doesn't like you.
3 Wait at least a month. If you see the guy you like somewhere where you wouldn't expect to see him, go up to him and greet him.
4 If his girlfriend is there, you might consider a hug. 
5 Be yourself at all times, no girl deserves a pathetic guy. 6 Try to get their attention. 