Ummm...from the write up in your SIG, it sounds like you have issues with getting / retaining women? Unless that is a joke?
I don't know your situation....I just know that in most cases it never works out. Sure you both miss the good times. They felt safe and predictable and she'll feel confortable around you. However when ever couples get back together...it is a bridge, not a destination.
Whatever ya do...don't start fawning or pining over her. If you do show her attention...do it in an alpha manner. And go spend some time on PUA forums to pick up some tips.