I'm sorry to hear about your situation. If you know the relationship is completly done, my best advice to you is to figure out what is best for you right now. If you have debt together then figure out how to take care of that, but also give yourself time to think about you. It sounds like you are in a lot of pain so give yourself some time and space away from her to heal a bit. Is it possible for you to leave and still be able to pay your debts off?
If she is being truthful and simply does not care for you the way she used to and does not wish to be with you anymore, then as you can see she is doing what is best for her. You must do the same. What is best for you? You are the only one that truly knows what is best for you and if you don't do what is best for you, nobody else will either. I'm sorry that you're going through so much pain,:(.