He is reverting to 'old ways' because that is where he is comfortable.
Maybe y'all should look into a Sober Living House where he can live, interact with others on the same road to recovery and finally LEARN how to live sober.
That way you could continue to work on you, he could continue to work on him WITH HIS SPONSOR and hopefully through phone calls and an occasional date and you will slowly, ever so slowly start to see if this will work or not.
J M H O
Love and hugs,