problem is, he's isn't THAT "new" of a recovering addict - 9 months is plenty of time to stabilize and get the head screwed on straight. he had a full 6 months IN rehab. so i think you are likely seeing more of who he is..........
maybe he really doesn't want to be married anymore.
maybe he met someone thru rehab or sober living.
maybe he's just a jackass.