One can have the mental illness of alcoholism and all the other isms that come with it, and not drink.
That's how I recovered, Smarie. I put the bottle down.
It's going to be hard for you to detach, I understand that. Do not under any circumstances open your door if he shows up. Just tell him - through a closed door - that he has overstayed his welcome and that your hospitality is expired! ...or whatever words. Be done.
If he argues, tell him you're calling the police. I've called the police on two different men, and neither one of them ever laid a hand on me - but they disrespected me on my own my property and would not leave when I asked them to - and I wasn't certain that I was safe.
Dealbreaker.