I don't think your H is back with OW. If he was, I think he would be sneaking around to keep it going and wouldn't be acting like such an idiot. Maybe he thought he would be able to reconnect when he went back to the school. Maybe this is the climax of him dealing with his rejection.
lwb-
How ya doing tonight? Neph has a great thought. Could have been slap in the face to your H.
Let me know how you are.
SueS
ME: 42, H: 42, D6 Together: 18 yrs. Married: 15 yrs. Attended Retrouvaille - December 2009 Status: Working on it day by day