I'd think about why you two broke up and realize that there's most likely someone better out there for you than your ex and that, no offense, there's probably someone better for her than you.
I'm riding the same boat as you, but my ex hasn't spoken to me since we broke up in June. She left the U.S. to study abroad in Italy for a whole year and has cut off communication with me, so I have no idea what she thinks of me or if she ever wants to talk to me or be friends again. However, I knew at the time of the break up that we were going on different paths and that our relationship was not going to work given the circumstances, and by standing on those grounds and putting my time and energy into my academics and clubs I've been much more well off than I would've been, especially if we stayed together.
So definitely follow Rougey's advice by keeping yourself busy with fun and rewarding activities like exercise, reading, going out with friends, *cough*leegunz*cough*, etc. Eventually, someone else will come along, but be careful not to set too many standards for the next girl you will meet (i.e. don't expect her to be just like your ex). You may find a dame well worth your time and effort with qualities more suitable for you than you may think.