Bipolar Boyfriend's family is unsupportive. Help please.

My boyfriend of over a year was diagnosed with bipolar disorder last summer. For the past ten years before that he was diagnosed with severe depression and has attempted three times, one of the times I stopped him. Things were easier when we were both in the same school together.

His self destructive tendencies have caused him to move back home to his family. As he puts it: My self-destructive nature has temporarily forced me out of college and to live back home. I've been twice diagnosed as bipolar, but my family won't have any of that.

They've been highly critical of my doctors---even threatening to kill them at one point for ruining my future. They refuse to take any part in my treatment, even when they're requested to attend. They're trying their best to keep me away from my best friend, who has supported me for the past year and has helped stop one of my prior attempts. They've even been critical of and implied I should halt my medication, although they've now backed down on this.

I'd leave, but I don't have the financial means to do so. To be independent, I would first need to be stable. To be stable, I'd first need to be independent.
I think---well, hope---that I can keep it together long enough to find a job and get the hell out of here.
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When I'm at home, I can't always be there to help him. I have my mom to take of as well. He's lost motivation to do much of anything, and says he just needs someone to be there for him in person when he needs it. Which I can't do right now, I'm restricted at home, and while I love him, my other obligations don't allow me to go to him.

I've been trying to talk to him online, listen to him, offer advice, but he waves it aside at times. I don't know what more I can do for him.

Can anyone give me advice here? Or can anyone bipolar shed light on how he might be thinking for me? Thanks.