man, sorry to hear bro. i felt the same way when my gf broke up with me (she also cheated on me so be thankful your girl didnt do that). anyways, what all my friends said i needed to do was spend as much time as possible with my closest friends and especially other girls (not necessarily to find another chick to bang, but just to take your mind off of your ex). to tell you the truth, this really worked. i hung out with a bunch of people. just hanging out with people and meeting new people will take your mind off of things.

best of luck to you my man. and cheer up