Webbers. What's the back story with him if you feel comfortable to share? How long has he been drinking and how problematic? Has he stopped and relapsed before? What made him go to rehab? The answers might help you assess his ability and underlying motives. He might have gone to rehab but that's a start. Commitment and change are needed to maintain it. That may take alot longer.
Don't go rushing to uproot your life until you are sure. And don't feel pressured until you are ready.