Lost - " i did so much for her when we were together " -that's part of the problem. She has taken you for granted. No respedct.
What I would do to get your power back is call her and literally ***** her out - put her in her place. Tell her about her games and how silly it was that she couldn't even say good bye AND what her friend told you. Let her know you won't stand for this and how imature and childish it is. Seriously - it would be good for you, especially now that you do not want to get back with her. You save a lot of face and she would see a new you. You were way too nice to this gal and she continues to walk all over you. You'd gain respect and she deserves it.