See I was sort of in the same situation but I was the user.
I’m 11 month clean and I’m going through divorce.
From her point of view her words “I will always resent you and see you as this person who used to lie and steal and take money.
It’s hard to move past once you start seeing someone like this. I understand why she can’t change her opinion and being the user back then it’s hard to take now as I’m back to that person she used to love before drugs. This also plays a part because I’ve got a new gf and moved on and she doesn’t get to have me now.
I’d suggest councilling but at the same time if he’s not been abstained that long don’t take your eye off the ball because he may do it again when he feels your guard is down. Just the mind of an addict
Sorry for being brutal and I hope you find a solution