I know what it's like to watch someone you love fall into the abyss of alcoholism. It hurts like hell. I, too, used to worry that Richard would become homeless but he managed to keep a roof over his head until his death.
As his behavior became more erratic and his health problems mounted, I found that the less I knew about his life the better it was for me. Let the house go, let what remains of your husband go, feel the pain and then let it go, too.
Happiness is there for the taking. That meant I had to leave Richard behind to fend for himself. These days, not much sorrow remains. I'm at peace now.