I think what bugs them the most is when you are nice because the guilt overwhelms them more. And they can become somewhat paranoid wondering if she is so nice, what is she up to or plottng.....
Just keep doing what you are doing. You certainly keep yourself plenty busy which is good.
As for telling you goodbye when he leaves, my H stopped telling me that a few months after I found out about the a. I just accepted it and went about my business.
The Bomb: 08/05 H moves out: 06/2006 H moves back: 01/07 & Out again: 01/07 H moves back: 03/08 & Out again: 04/08 H moves back: 05/09 & Out again: 07/09 Divorced 08-12 Kids: 22, 20, 19