Something else to think about is that you can't legally keep him out of his own house. We have some here that are living with their alcoholic simply because they cannot force him to leave. Even if he were to leave for a while, if he decided he wanted to return to the family home, you wouldn't be able to legally stop him.
It seems to me that it might be best to just stay where you are for the time being. If you decide to divorce, you can have orders drawn up as to who can live in the home prior to the divorce being finalized.