Devastated
Your husband can handle this the way he does, because he isn't codependent.
My husband isn't either. For years he watched me do the pretzel dance and participate in the chaos, and I would go on and on about "what if and "why doesn't he" and "why does he"...and in the end when I dropped exhausted from my frenzy, he would say "he knows he's an addict, he knows where help is, he'll get help when he's ready".
My son, and most of our sons, cannot live at home because they make us crazy. We take them in because we are afraid of what will happen to them if we don't, and then they play the game, get disrespectful, steal from us, use while living here and manipulate us. My son and I have a good relationship today - because he lives somewhere else. I don't have to watch or participate. He is respectful when he visits. Without exception, every time he moved home it was a disaster.
And guess what, he survives. He learns responsibility living on his own, and he learns to look after himself.