Have hot sex with the new guy!
Call them and see what they think. Or go workout, use drugs, spend time with family, etc. I would probably get drunk or high or both. Who knows
Chocolate, ice-cream, the most chick-flick-iest chick-flick there is, and a bunch of your girl friends over.
My ex-wedding anniversary is New Years Eve ... so I just carry on seeing in the New Year!
Try to forget the biggest mistake I ever made.