Time to go see a therapist. Insurance will pay for it. You obviously have some control issues to sort out; no shame in that, just get help.
She's been very clear to other people about where she's at; she probably only tells you what you want to hear because you bug the shit out of her until she says what you want to hear, and it's a lot easier for her.
She wants space. Give it to her. You cannot control anybody but yourself. Period. It doesn't matter what you say, think or do -- she will do what she is compelled to do, independent of your wants, needs and desires.
You need to go about catching up with yourself, learning who you are and what your values are. Drop ALL contact with her (I don't care if it's rude or whatever), forget the money she owes you because you aren't going to see it and you will only use it as an excuse to maintain contact.
Many, many people have been through this and worse situations; this is not unique. It's up to you if you want to succeed or if you want to sit around and blame others for shit you knew in your gut all along, was wrong.
That is all. Good luck.