Through my limited experience I've noticed that it's generally a bad idea to try and be friends with someone after a breakup... maybe a couple years down the road it will work out, but even then things can get pretty sketchy. Especially when it comes to your ex's love life. My advice, (do with it what you will), is to steer clear of her. No contact at all. Good luck, and remember... be kind to your body, it's the only one you get...