I just got home in the last three minutes from a Narcotics Anonymous meeting. I'm celebrating 26 years clean and sober next week. I mention that because I might know a bit more than the average person about such things and I'd like you to take what I am about to say seriously.

Leave. You want to help your daughter? Leave. You want to help yourself? Leave. You want to help him? Leave. Because if he is an addict (and I've never met a social meth user), it's going to get worse, never better - and he's not going to get help until he has to start paying consequences that he can't bring himself to pay. Losing you and his daughter might be the very thing right now. A year from now, that might not be enough. Wait too long, give his addiction time to grow, and the things you swore he'd never do will come to pass.