I agree with not saying anything. Maybe leave a note on the kitchen table saying you're on work travel in Tanzania in case he does stop by to get his stuff. I wouldn't even volunteer where you are when there unless you have to (like he asks where you are).

He needs some kind of wake up call. Maybe you vanishing will help.

Me: 34 W:33
T: 10 M: 6
S: 6 D: 5
BD: 5/14
Still together(ish)
Not giving up: 7/14
D talk has slowed, a lot.
Gradually working on things together. Still separate bedrooms.
Slow and Steady wins the race.