I know how hard it is when they return home. You want them to profess their love for you, say they will never do anything to hurt you again, and have no OW around at all. I know, honey, it sucks.
You have to decide what YOU want. If having him home is too hard for you with him still in contact with OW then you need to come up with some type of plan. If you can stand it, and DB and bury those feelings of rage for now, then do it. Go in another room and scream into a pillow, talk to yourself, go for a walk, anything to release that pent up energy.
I know their is a typical mourning perious they all go through when ending a R. I think I read it in Love is Tough by Dobsen.
I am going to catch up more on your sitch.
Sherry, he is home. That is a start. And he sounds like he is wanting to work on things. Keep up your GAL and PMA...Make sure you don't forget about Sherry.
Keep reading your books. Keep staying busy. Validate. Listen. Act as if..You CAN DO IT!