move on!!!! 4get him/her.

what i do is try to make him want me back by flirting w/ other guys and act like i never even liked him in the 1st place! (i at least try it even though sum times i CANT HIDE IT)

^^^^ See that won't help at all!!!
I know from personal experience. I mean yeah, maybe that will help if your like in the 2nd grade but for "real relationships" you have to get your mind off him/her surround yourself with friends, concentrate on school/work and try not to be alone!!!!!