Rachael, Just my two cents...I think he's back in the game once again...affair wise. I don't know if it is an EA or a PA, but the primping and working out may be important clues. He's most likely being nice to you again because he doesn't want you to suspect anything and yes, he's getting attention elsewhere.
I seriously doubt that he will go to the therapist, even if it is to help you.
I'm so sorry that you are in this situation.
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.