I've broken up with him in the past and each time he went about a month without drinking or using, which I saw at the time as a valid effort.
He has fully admit that he has been using this whole time, at first I got angry and felt completely betrayed. But I'm at the point where I want to help him, I want to support him. Isn't that what love is all about? When you have relationship issues you build and work on them. Not just throw in the towel because times are tough.