Sasha you seem to have most eventualities covered by the agreement as well as the key fact that he acknowledges his addiction. Sad but predictable that he went drinking (the evidence points to) afterwards. He would have been really making an effort prior to arbitration, and the recovery talk was possibly false confidence. Such a pity he couldn't keep it up. I really hope he has that breakthrough that will lead to genuine recovery for everyone's sake.
Well done you.