I haven't read your story thoroughly, but I get moments as you have described as well. Not much to offer you except a (hug) and a empathetic ear (eye). Lol!
I have tried to stay out of my H's way, really hard with the kids and I do know about OW in my case, and you are right....they will do what they want.
I hear a lot of acceptance in your post. Maybe that is just me...I am there for the most part, but don't like it...this is rough stuff.
Please do take care, as you seem to be doing.
BombOctober 2012- OW 11/28/12 -H still denies Separated 11/29/12 Own place 12/12/12 Confessed OW/EA/PA 2/2/13 Oct 2013 - I knew I was done Jan 2014 - Anticipating the rest of my life