LH19, SteveLW, Thornton, and Traveler all have great advice for you. I agree w/them.

What would happen if you stopped making dinner for him and instead made yourself scarce in the evenings around the usual time? E.g., meet up with a friend for dinner one night, pack a sandwich and go on a hike the next, go to the movie theatre another evening...etc. You don't have to tell him or explain yourself...just go out and have fun.

Me:39 Ex-W:37
M:7 T: 9
S:6 D:3
BD/IHS/Confirm EA/PA: Feb '20
OM1 affair ends: May '20
W/OM2 & moves out: June-July '20
W files for D: Jul20
OM2 confirmed: 9/2020
Divorced: May '21