Smarie,
Nothing changes if nothing changes, my friend. I know that you feel you did "good" by telling him no that he couldn't stay. But what about the other 30 things that he did before you told him no.
No means no. I agree with Lexie and the protective order. You can do this, you have friends and family. Your addiction to him is as strong has his addiction to alcohol. You just need to stop enabling him, he will never feel the consequences of his addiction if you don't let him feel the cold outside. His rock bottom is not going to be drunk inside a warm house with a women who loves him.
Keep reading around the forum and educating yourself my friend. You can do this!!!!