I'm sorry you are in this place. It does seem that moving out to "be alone", "find happiness ", and "become a better father" (all common on this board ) are euphemisms for OW. It's good that you are releasing your anger. Please don't be too hard on yourself-it's understandable that you believed your h as you've known him for so long.
In regards to your h's suggested modifications, they are absurd. I agree that it's way too soon for intros to OW, but he is being rather self centered at this time disregarding anyone's feelings other than his own. However, I strongly doubt your h is going to listen when it comes to OW. She's his shiny, new thing and wants to show her off.
Hang in there!
3 kids BD 12/15/13 (IDKIILY. ) Rope dropped Cirque du Soleil style D final 9-9-14 "Some people are born on 3rd base and go through life thinking they hit a triple." Barry Switzer