I entirely empathise. I am married to a sulker, who in 1993 didnt talk to me for 9 months. Not one word. It started August Bank Holiday, and ended the following April. That wasn't the only time, but it was the "biggy". It is a form of control and manipulation. From your latter post, and the comments you made there, you are what they call "trauma bonded" to this man. (Look it up online...Melanie Tonia Evans). I have learned a lot by reading up. We have been married 40 years and my circumstances (mainly financial) have made it impossible for me to go anywhere. That and a fear of the unknown, as I suspect it is with you, too.
We have not shared the same bedroom since December 2008. I love the space of my own room, and no more pressure (if you know what I mean). However,
the lack of "that side" of our relationship is never discussed. My husband also had major heart surgery 5 years ago, after which I helped with his recovery. We now tick along, but more as house mates. To the outside world I'm sure we are viewed as a perfect couple. Strangely enough, so far we have got on really well throughout the lockdown with our enforced imprisonment. I am furloughed from work but I am usually away a lot with my job. Even that would have been unheard of 25 years ago, as he had the old school view of "it's not right that married women are away overnight " (his words) which I had to challenge and fight against when I completely changed careers at the age of 49, unchained myself from an office desk, and became a flight attendant - much to his disgust. He did everything to sabotage my new career, but I stood my ground. It was very, very difficult not to succumb to the sulks, just to get an easy life back. I almost threw in the towel, but didn't, and I am still flying after 16 years. As to leaving, I haven't made that one a reality. I think it gets so much harder as you get older. It's damn frightening, and if, like us, you still have a huge mortgage and not much equity in the house, it's realistically not going to happen. I know so many people on here suggest you both go to counselling. I know for sure my husband would never consider it in a million years! (as there's nothing wrong with him ?). I do feel for you. You are not alone by any means.