Smitty what you describe is exactly what my H went through in August. It is OW withdrawal and the crisis is far from over. In August H was nuts but towards the end (after losing his job and hitting rock bottom) he finally made a decision not to leave his family. Notice I said leave his family. He came home for the kids and finances, which I am told is pretty typical. I didn't care at the time, I needed him here and not with her. The first 6-8 weeks were weird and rocky and withdrawn. Let him pursue you and keep your detachment. It is hard because one day they seem so normal and the next they are not. Oh we had fights, big ones and he didn't run (which he usually did before.) H has told me things about his relationship with OW, not all good and not all bad. Try to be there to listen, that's the hard part. Be the lighthouse, there is bumpy road ahead of you.
H tells me now that he no longer yearns to see her, be with her etc., but openly admits that he did and it was rough for a few weeks. (Yes that sucks and hurts.)
(((HUGS))) Although this stage is better than replay, it is not easy. Patience is key here and often hard to have because you so want this to be over, but it is not. Now it is two steps forward and little back and there is some more visible progress. Keep posting.
Do not anticipate trouble, or worry about what may never happen. Keep in the sunlight.
Benjamin Franklin