One quick thing, Milf-
That's nice he wants to have a relationship with his kids NOW, but he could have been having a relationship with them all along if he decided being with his wife and kids was more important than using, right?
This is AT LEAST ONE consequence of his using that HE'S going to have to come to terms with. The more he blames his wife, the easier it is to see he's not entirely ready to hold himself COMPLETELY accountable for his actions and his addiction.
Unfortunately, his being in rehab isn't a completely accurate measure of how serious he is about his recovery. Only time will reveal exactly how serious he really is.