Honestly, let him go. You're not married to him. You don't want this life. I have been married to my AH for almost 7 years and if I knew then what I know now, I would NEVER have married him. Loving an addict is not enough to make them want to live a clean, sober life. And it doesn't sound like that's what he wants right now. I would not wish what I have gone through with my husband on my worst enemy. I'm sure most others on this site feel the same way.
I don't mean to come across harsh or abrupt, but I wish someone had given me some advice along these lines before I got married. My choice would probably been very different and possibly saved myself alot of pain and misery.