OP
I just read your comment about your weight gain, and I think you could be on to something, hear me out.
When I first met my ex I was a slim size 12. Over the few years we were together I gained weight (I'm 50, it happens almost by magic!) and went up to a size 16.
My ex lost attraction and stopped having sex with me. He said his lack of libido was not related to my weight gain, that he was just tired and drinking too much, but I never believed that. When I found his porn searches, they were all for young, slim, big boobed women. I'm the opposite, size 14/16, 50yrs old, small boobs...
I also struggled with eating disorders throughout my 20's and 30's, I was determined that I wasn't going back to that state of mind.
For the sake of my own sanity and self esteem, I ended the relationship (there were other factors too btw).
I had never been rejected sexually by any of my other partners and his behaviour came as a real shock. I was used to men chasing me around the bedroom and getting moody if I wasn't up for it!
I don't think a sexless marriage can work if only one of you wants it that way. You are so young, you have so much life in front of you. Please don't stay in this situation.
There is someone out there who will really want you, in every sense of the word. Someone who will make you feel like you're the most beautiful woman in the world. We all deserve to feel loved and cherished.
This man has checked out, do yourself a favour and file those divorce papers. You're children will be learning a very warped version of how a loving relationship should look. Your relationship with their Father will do a lot more damage than a divorce would.
Please think long and hard. Listen to the advice you've been given here. Get out of this situation.
Sending you so much love and support. Please keep us updated.
P.S. I'll be thinking about you all day now!