Gonecrazy,
He is doing alot of changing and growing. It is certainly possible that he may have changing feelings about your relationship. It isn't about you tho and you can try to not internalize it too much. If you are both in recovery then keeping the lines of communication open and taking it all one day at a time should take you both to where you were are meant to be.
Personally...I am married one day at a time.
Hugs,
JT