[oneredED]

Best thing i've found for bad break ups (if you're not the instigator of the break up) is to go and get laid by someone else. Whilst it does sound quite petty, it does help to take your mind off things for a while.
Getting ****ed works for the first few days, but if it's been a longer relationship, talk to another close female friend (not with the intention of screwing her) about what happened etc. It's something girls have over us, but they generally make you feel better just by talking to 'em rather than the "she was a fat stupid cow and we all hated her anyways" that your mates end up saying when you get ****ed the night of the breakup...

EDIT: and whatever you do, don't go back to the person. I did and it bit me in the ****. Not worth the extra trouble. If it was bad then be glad you're out of it.