Your H's behavior with OW is not healthy, you realize that, right? And I don't mean in terms of he's having an affair, I mean in terms of this drunken woman with a H in prison calls him and he drops everything to help her, even before they were "involved". That's a big red flag. There's some co-dependent hole he's trying to fill.
Not your problem. I know it hurts but you can't even go there with him.
Addicts seek each other out because they can feed the monkey without other people judging them. They can support their addiction and encourage each other with "no one understands me but you." He gives her what he didn't give you because he's safe with her.
Enough about him.
Do you go to AlAnon? I know I ask most people here that and often more than once. Excuse me if we've had this discussion.
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss