@emotionalpuddle I don't usually wade in on relationship stuff too much but your posts resonated with me greatly.
I got divorced at 35/36 (2 years ago) after 10 years, and my middle aged, sexually incontinent husband thinking he would be better off with a 20 year old from work. It was crippling and I spent about 6 weeks feeling like I was dying inside.
And then I realised what an escape I had - thank your lucky stars you didn't get married. Do not leave the house.
I think places like MN can be a bit skewed as people come and post in dire circumstances, but there are decent men/women out there who have no intention of behaving and treating people like this. People just don't tend to post about their normal happy lives... !
On reflection I had spent my whole dating 'life' with men who followed to a greater or lesser extent the behavior of my EXH. Arrogance and narcissism masked as confidence etc, and selfishness blamed on me for being unreasonable etc. I spent 2 years prior to separation having my confidence and self worth eroded to nothing, while he lied and cheated and messed around with someone barely older than his own child. I could list incidents of betrayal that would make your toes curl.
I am now two years on. I bought him out of the house - get a good financial advisor and see what you might be able to achieve - don't just write it off and don't take any notice of anything he says. Do not trust him to hold promises or agreements. You can get agreements lodged with a solicitor even though you're not married.
My life is infinitely better than it has been in years. I met somebody else, and although we don't want children, he is like nobody else I have ever met, and to a degree it's bittersweet as he has shown me time and time again that good people do exist. But new relationship aside, my confidence is back, I no longer feel worthless and like i'm the last consideration, I feel like a physical load has been removed from my shoulders and chest to the point that I can barely believe I allowed myself to be worn down and emotionally abused in that way for so long. But that's hindsight, and you'll get there.
I know it's painful now, but you will get over this. He is not worth your tears and efforts as he has no respect for you or your feelings. Your 30's is nothing. Draw a line and move on.