If that were the case, this woman would have chosen the OP to begin with. You make it sound like she's the innocent one here. This isn't going to work, no matter how idealistic you are. She disrespected him then, why change now? The OP should move on.
As much as I want to say "give her a chance" I reluctantly have to acknowledge this point about respect and the one Alin made about her deciding if he was worthy of sharing herself with and her deciding he wasn't. If there was no respect and no desire, I find it unlikely that situation would really change and if it has and I was in his shoes, I would need ample proof in actions, not just words. As I wrote in another thread, loving words are very important and need to be said but it is loving actions that prove or disprove. Words, even if sincere, may not match what the heart really feels but actions, especially over an extended period, IMHO rarely lie.
* Just to clarify, loving actions doesn't just mean sex. It also means the little things that one person does for another when in love, whether it's at the start of being in love or well into it.