I can really feel your sense of despair from your posts and I’m so sorry. What I can say is that it WILL get better and you will make a life for yourself that is fulfilling in ways you can’t imagine right now.
My marriage ended just over 2 years ago (wife had an affair with our friend and left for her) and I was so devastated I thought I’d never get back up. Similar to your situation, there was a lot of accusation that I had “made” her do it by not putting her needs first etc. At the time my 2 older kids were late teens and we had a 4 year old together. We both worked but I did 100% of the domestic “work”. I probably did coast a bit in the marriage but I thought we were a team so the affair and leaving was such a shock. She also refused any counselling.
I had a lot of therapy (I still go now - had never had therapy before but this has been so helpful in reframing my mindset). Over the past year I’ve done some dating and although I think I’ll probably be on my own for the rest of my life now (I’m nearly 50), that would be ok. I’d like a relationship but I have a good life. My kids are great, I have a new (good) job and I have time in my life now to please myself some of the time, when before my entire life was work and serving other people’s needs (looking after the kids and house and supporting my wife’s big career). I’ve learned to say no to things I don’t really want to do.
Life is not always as we want it to be, but it can still be good and you may be surprised to find in a year or so that you are happy. The divorce bit is rough though, very hard, so I do recommend therapy especially if you feel you can’t talk to friends or family.
And if you need an uplifting song to listen to, “Still Bad” by Lizzo is perfect for this situation.