Sounds like you are finding the courage, through whatever course need be -- anger, frustration, indifference -- to put an end to this drama in your life. No need to wait for him to start using. You know how it's going right now, and right now sucks. Keep your chin up and don't look back anymore, Mom's Rainbow. You have enough on your plate to worry about without another "pet" who is hell-bent on destroying the current place and your relationship. He's looking for an "out", not recovering, in my opinion.