If you truly want her back, and it sounds like you really do, then do whatever you have to in order to make that happen. Don't let it be. Life is too short, IMHO. If you want it (her), go do what it takes to make that happen! Especially if your self esteem is not so high you won't take the needed steps to get her...now is the time to strike. If, after all efforts possible it does not and cannot happen, then, and only then, can you walk away knowing it is lost. Else, fight for what you want to have. That is my opinion.