1. Break off contact with her. Make sure you unfriend her on Facebook. Get rid of old letters, photos, momentos, etc.
2. Start a process of forgiveness, first with yourself, then with her. I have found this to be very helpful: Ho
3. Take the time it needs. Sometimes it takes longer than you think it "should".
4. Do the things you love, and find new things you love.
5. Know that you will heal and there will be another.
It sucks getting hurt. I've been there before and feel I am a better man for it...