I just wanted to say that you’re not alone.
My ex partner and I broke up just last week. He had been treating me more and more unkindly over the last year, in incredibly small increments, as a result of his poor mental health.
It reached a point where I couldn’t go on if there was no change in the relationship. When I told him this, he told me that he did’t believe that there would be any change, and that he wasn’t willing or able to try.
He has refused couple therapy, individual therapy, medical help, or any other type of help, either with me, by himself, or as a couple.
I don’t know what has been going on between you and your ex(?) partner, but it is not possible to help people who refuse help, or to fix people for them.
It is no good very bad to break up at this time of year. But it’s worse to be miserable and lonely while still in a relationship that is a relationship by name, only.
I’m sending hugs and solidarity.