Funny, I am going through the same thing. The ABF has vanished.. I'm about 80% sure he relapsed. I was frantic when I figured this out, thought about who I could call or talk to blah blah blah. Then I realized NONE of that would bring him back to sobriety. It was me spinning my emotional/co dependent wheels.
Worry is a normal response. But I know now that I need to worry about myself and how to not let his alcoholic world invade mine, or suck the emotional lifeblood out of me.
I'm protecting my space. And sounds like you are too.
Thanks for posting this btw.