Rehab patients are encouraged to put their sobriety first, regardless of personal relationships. This doesn't mean that they should separate from their spouse or long-term personal relationship, but that they should be aware of pitfalls that can deter their progress. If he chooses to do this, then you have to decide if you want to stand back and let him work on his recovery, or if you are not willing to do that. Just as he has decisions to make, so do you.