I’m really sorry you’re in such a horrible situation.. But on the upside he’s making it very easy for you to tell him to leave.. (I know it’s never easy, but no one could put up with that behaviour). You’re being more than nice not physically locking him out of the house. It’s important to focus on looking after yourself now, I’m sure you will feel great relief when he is gone and you don’t have to worry about him constantly.
I’m currently waiting for my partner to get a space in rehab and I feel in constant anxiety that he’s going to relapse beforehand. So wishing you lots of strength and support from your friend to get through this horrible period.