It's cool. No thanks needed. Have you kept up with Alimari? She is fighting some of the same battles you are.
The key is to let HIM leave the OW and put her behind him. That way you know it is for real. You cannot force it. If you do he will build up resentment.
However I think you need to draw a line in the sand in your own mind. How much can you deal with the back and forth and multiple times? Choose your own path. Do not let him dictate your life. I know it is easier said than done. Your hubby is a lucky man to have you by his side. I hope he sees this befoe it is too late.