Amusic,
Get legal advice for sure. Co habitation laws and tenant laws need consideration.
I would get a lock for the bedroom door. Remove his belongings from this space. Tell him it is over and you want him to leave. Tell him you are getting legal counsel and are willing to give him whatever legal time he is entitled. If he decides to go before that, you will refund him the rent for the days he is owed. He should sleep on the couch or floor until he leaves. If you have male family or friends that can be present to help you through this situation, you should have them come over. If he is verbally or physically abusive, call the police for help immediately. I suggest spending time away from the apartment as well. If he makes attempts to get sober, that is great but make sure he knows that changes nothing. He needs to be sober a minimum of 6 months before you will consider dating him again.
Best of luck and keep posting.