I don't know the feelings of being to someone who is a drug dependent, but I can imagine how life like a hell. You work hard just to earn money and yet all he did was buying drugs. You might seek for help to someone who has a huge knowledge regarding with laws. You can consult a lawyer, so you would also know and get ready for the harassment the moment you tell him about divorce, he might be violent when he got mad. That's what the drugs can do.