Most Helpful Guy
It will go away. It doesn't seem like it but it does.
Most Helpful Girl
You need a change of pace and a distraction. If you can, take some time off to travel out of town. Throw away anything that might remind you of him. Even if you feel crappy, force yourself to be social. Eat, try your best to sleep. Allow yourself moments of weakness - if you need to cry, then cry. Let it all out and then dust yourself off. Listen to happy music.
Get up in the morning and take that extra time to do your hair and makeup. BE GOOD TO YOURSELF and realize that you made the right decision!
Hang out with some girl friends, join a gym and work out the frustration. That is what has worked best for me. And if you can, avoid romantic movies or books for a while.