Of course you're the one that caused his relapse-- who else does he have to blame bc he definitely isn't going to blame himself. There's nothing really you can do. He has to do this all himself when he is really ready. It's unfair that you have to live this lifestyle bc he can't get his act together. I'm reading "the new codependency" by Melody Beattie. I recommend it.
You have to make time for you and worry a out you. The more we dedicate our worries on them the more we lose ourselves.