Who can I turn to

I have been with the same guy for 12 years, and we have 3 kids together. I am only 32 and I feel trapped. I dont drink, do drugs or go out. My life is my kids, and my world revolves around them. My problem is that I do love my boyfriend but he has alot of issues. He gets drunk and passes out every night. He smokes weed. And I even caught him with coccaine and crack before. I tried to save our relationship by moving out of the city where we lived. And he did good for a long time. But now I feel like we are right back where we started from. I would probaly leave him right now, But even though he parites alot he still gets up and goes to work every day. And I cant afford to raise my 3 kids on my own. I am a waitress part time at night. I know my kids love him and he loves them. But he can be such a jerk to them also. I asked my kids if they wanted to leave and they say yes and no. They just dont want there dad to be buy his self. They would feel sorry for him. I tried to get him into drug and alcohol rehab. but with insurance we still cant afford it. Plus he has been diagnosed with bi polar and his moods and anger is terrrible. Somebody please give me some answers.