Maybe if you tell her that you want to know what drove her away, so that you can work on yourself for yourself, and so that you don't continue making the same mistakes in your next relationship and so could really use her insights on you, would be the way to ask?
Great idea NYS! I've been struggling on how to get this info and by George I think you've got it! Regardless of how this relationship ends up, I NEVER want to go through this again. I want to take all that I learned from DR and KLA, and customize it to me. I want to know what was so unappealing about me and use the DR/KLA ideas to continue changing me.