Hi Breton--
Wow, our sitches are really similar! My H lost his job as a school administrator last winter, and the OW was a teacher who was upset about it and started pursuing him. So he had the career thing and the worshipful groupie thing as well!
A double whammy-- a needy emotional woman to save and an avid admirer.
H was married before me, very young. She was needy and depressed. I am the exception, like you are.
I do worry that the DB stuff might be making him think "Oh well, she's fine, I'd better concentrate on this crazy OW..."