I agree w/the other posters...sounds like he is realizing that the grass isn't greener on the other side of the fence. OD and OW must be on the outs.

I hope he continues to be there and continue doing things w/your son. Time will tell what is going on w/him.

Sit quietly, the answers will reveal themselves when you least expect them to.
The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.