Hang in there, BB. yes, be as supportive as you can. It may be that he is struggling right now, it is really hard to get rid of an OW, but keep on DBing. It shouldn't stop just because he has said he chooses you.
The pain and doubt on your side is that hardest to deal with. I am already 3 years out of it but once in a while I still recall what happened and it still hurts. It will really take time to get back to what it was, if ever. But I will tell you, if you do not let it rule your life the insight you gained into the relationship will help you make it even better.
Your husband is a good man; he cares for your daughter, he realized it is an illusion that the OW gave him.... the illusion that grass is greener on the other side. Lucky you, he is affectionate. It shows that he has made the decision to love, and that is the most important. He may be fighting whatever leftover feeling he has for the OW, and that will make himn a bit depressed and distant for a few months. That is normal.
I am confident that if you don't push him away by being demanding, by allowing him to heal, that you will have him back. Don't confront him yet, now is not the time, there will be time for that later.
Me:49 H:45 D:12 M:14 T:18 Bomb: 6/26/10 EA: 9/3/10, fizzled out slowly, now ??? 11/5/11 Retrouvaille Finally piecing.... Its peaceful at last, but we got a looong way to go