beer and strippers are what you need... 😛
Seriously, like the others said, time is the only thing that will get you over it (though alcohol and naked chicks can help quite a bit 😀). Sit back, relax, and do what you usually do. Before you know it, you'll realize that you haven't thought about her in quite some time. What used to work for me was to tell myself that if we couldn't make it work out, it wasn't meant to be. It's an over-used cliche, I know, but at least you can look back on the time you had together and smile.
Good luck, and be sure to tip the strippers. 😉