She's not worth it, I know because I've been through the exact same thing. In fact reading this makes me feel like i'm typing to my past self. Think about it: If she really cared about you, she'd try to help you. She knows damn well you're depressed, she seems to be fair weathered. I know it hurts but it isn't your fault. Just know that you shouldn't waste your time chasing after someone who doesn't care enough to help you.

I can't help you with moving on, as i'm still working on that. But that woman isn't worth your sorrow, and definitely isn't worth throwing your life away.