Julia, I like the analysis! That's great that you are reconsidering the big picture of your interactions.
This is a little crazy, but I have been trying to limit my time on the computer for numerous reasons. After going through one full day of complete NO computer, i realized how much time I spend in front of a screen for no particular reason. I started not even turning the computer on until after lunch or even later. Maybe you could start checking your email less frequently (once a day, or at 12 pm and 4 pm only, or not on saturdays, or whatever worked for you) and then just tell him you were doing email detox.
You could even set a auto-reply that said, I'm not going to be on the computer for X amount of time, if you need to contact me please call me at (your number).
Kind of crazy but might be worth a try. love! REBECCA