I've been through a pretty bad breakup myself and i thought i wanted to win her back as well. I learned about the game during my breakup, and i turned it around. She was the one who should be happy with ME, I AM AWESOME, not her. Oh well, of course she is, but i am MORE awesome and she should be seeing me as price, not the other way around. And if she couldn't see that then it's her loss. I broke contact and started working on my game, after 6-8 weeks i had a few girls chasing me. Around this time my ex-gf contacted me to catch up, she missed me and wanted to talk. She lost interest in me as well, that's why we broke up. So when we met again, i told her about was i had been up to and i was very cold about it. After this she desperately wanted me back, now we have an open relationship so i can still work on my game and be with her. Roles turned. Now she is the one chasing me, and i have no responsibilities towards her what soever.
I'm not sure if this would work for anyone, but blindly chasing her and keep whining about how important she is to you will probably not fix anything. You have to proof yourself again, and make yourself the price she thinks its worth fighting for. I love my girl till this very day, alot, but i don't rub it in every day. Make her work for it, make her earn it. If she doesn't, then i'd say it's been a good run, be thankful that it happened, and move on. It will all happen again, better, with a girl who fits you better
Good luck bro!