For me, the best way to get over a break-up has always been keeping busy. Go out with friends, do hobbies, meet new people... anything to keep from sitting around feeling sorry for myself.
The pain fades gradually, but it takes time.
Sometimes it helps to put their picture on the wall and throw darts at their face. A little passive aggressive perhaps, but fun nonetheless...
“As I am sure any cat owner will be able to tell you,
someone else putting you in a box is entirely different
from getting into a box yourself.” —bisexualbaker