"hoping that he would offer to join me" "and I made him a plate"
STOP reading if you do not want 2x4s.
HOLY CRAP
This has got to stop. First, hoping he'd join you?!? WHY? KC, do you really have self-esteem low enough that you would want breadcrumbs from the table of a guy that is sleeping with another woman? In fact, if he had offered you should have said "No thanks. I got it." You are so desperate for any attention he is willing to give you, and he doesn't even deserve YOUR attention.
And fixing him a plate?!? I have been married for almost 21 years, and I can count on one hand the number of times my W has fixed me a plate. And most of those times was when I was sick and/or injured!! KC you have to stop trying to nice him back. Do you know what it does to a lying cheater when you do things like fix them a plate. It says to them "Oh, she is okay with the fact that I am sleeping with another woman! WOOHOO! Score!"
If your puppy poops in the middle of the living room, do you give him a treat? Of course not! That reinforces the behavior.
In fact, you shouldn't even have asked him if he was hungry. The food you prepare is too good for a lying cheater. "Go take care of your own needs. This is for me and S18, not lying cheaters."
I really hope you follow up with the attorney, because at this rate you are going to end up D'd.
(Note, I do not say these things to hurt you, but to try to wake you up! WSs require tough love. You have been here before. You have been at this again for a few weeks. You should be further along the DBing curve than this.)
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018