How do I remove myself from an unhealthy friendship?

I've heard that constantly having someone use and guilt you is very unhealthy and should be avoided. Well, unfortunately, I had a friend who didn't start out that way, maybe she was just hiding it to make friends or maybe it was something I did that caused her to allow herself to victimize me...either way, I was warned a number of times not to let her get close to me and I thought they were just being mean. Anyway, they were right! I should have never let her into my life. At this point, we've been living together (because she pulled the "woe is me, no one wants to be my roommate" card, which I fell for) for a few months and she never stops bitching and moaning about EVERYTHING. She's too good for her job (even though she's making nearly twice as much as I am, she expects me to feel bad for her), she hates how small our house is (even though she picked it out of 4 or 5 places I would have been fine with, a few of which were bigger), and so on. She expects me to constantly feel sorry for her, and when I don't she accuses me of being a bad friend and not caring about her feelings. I am in no way happy with this relationship, I have told her numerous times that her complaining about how bad her situation is offends me and makes me feel like a lesser person for being in a similar situation and being okay with it. I've tried telling her over and over that everything would be okay, I've tried being empathetic-to which she replied that she was offended that I would compare my "obviously" better situation to hers and wouldn't talk to me for the rest of the day (super awkward when you're living with the person), I've even tried to be an in between for her and other people she's had problems with to see if we could work out some middle ground (just led to me being accused of "taking the other person's side"). So I just need her out of my life, I think I'll be happier if I have the time to deal with my own problems instead of always dealing with hers. Now, I just need to know how to get out without losing everything. Our deposit will probably come back in her name when we move out, so should I just expect to lose all the money I paid at the beginning or is there a way around this? I have other places I could live, and our lease is up in a month or two, so getting out of that part won't be a problem, but I'd like to manage to get out without having her keep all the money and potentially some of my stuff (I've had her past roommates tell me she'd done that before). Please help!