I still love him....wat do i do???

ok i dated this guy for like ever andhe broke up wih me b caz i wouldnt let him out it uo my . so the next day i c him he is with another girl and i feel like my whole world is crashing down around me. every time i c them together i wsh it was me still in his arms not that little *****. i dont know what to do. i love him to deatyh! but yet i hate him with a pion for wat he is puting me through.....what do i do? still love him and suffer? or wat?