"And it was usually with a guy that would drop her a few weeks or months later because he was bored with her"

At which time many will try to boomerang back to you. The more ballsy bitches will claim it was all your fault, but are willing to give you another chance. How to deal with this? Non-attachment. It's what gals call being 'emotionally unavailable', which is bitchspeak for untameable, uncontrollable, and hard to manipulate. Zen teaches it, as does some Indian Yoga (called Vairāgya). The power dynamics of any sort of male-female relationship always requires the gal to need you twice as much as you need her....the minute she senses the tide has changed in her favor...you're screwed.