"I am not going to live with his alcohol abuse anymore and that it may mean that one of us needs to move out."
Is the part about one of you maybe needing to move out a weak ultimatum?
Whether one of you will move out if he doesn't change his lifestyle might be something you give some deep thought to while you are away in Fl., so that 'you know' what is going to happen, what you are prepared to do and do it. telling him isn't setting a boundary.