How to forget your girlfriend?

i broke up with my girlfriend because she was loseing interest in me and was seeing another guy, Now i cant stop thinking of her and all the good times we had in the past, its really stressing me out, how am i spose to froget her and get her out of my head. if you ask like this my answer is

Stop thinking about her. Every time you find yourself thinking about a "good time" remember the bad times. Throw all of the things that remind you of her and throw it in a box and give it to someone to hold for you for 2 years. That'll help keep your mind off of her. After 2 years you should be able to handle seeing it without crushing on her. And simply put a rebound lay will help you immensely. Get out there and meet women. And don't tell them you just got out of a relationship!!! Be fun and you'll have fun. Once you're moving again you'll start to feel better.