That's why we call it a roller coaster.
Every alcoholic I have ever known, only one has stayed sober for life and that's my mother. The rest went down the road to dispair and poverty.
My last husband was addicted to drugs. Pretty much the same story. He drug me into financial trouble big time. Getting my self out of his financial mess has been a huge burden and a tremendous source of grief.
I just don't need that crap any more. I have my own life and my own future to think of and I don't want to live it in fear and anxiety.
You will do exactly what you need to do and want to do when the time comes. If yo see him, then you see him. You shouldn't kick your self for it.
Just set up some boundaries. Say to yourself, "I will only go this far and no farther" then stick to it. This is how we protect ourself from all angles of harm.
Good luck to you dear.