In desperate need of a hand hold and advice... Sorry for the long OP.
I left my marriage more than a year ago and moved me and 5 yo DC into a new home, set up a new life and put DC first rather than put up with a bad marriage where I was "doing everything" of carrying the physical, emotional and mental load, making me miserable, frustrated and angry. The marriage was a horrible place to be for everyone. Afters years of trying to make things better, trying everything to meet my husband halfway to communicating, mostly getting myself worked up and hitting a brick wall every time, working on the marriage and changing myself, it became apparent that things were not going to get better. In the end I left for DC's sake and the last 6 months of the marriage was basically silent treatment from Ex after he decided not to talk to me about anything, refused to talk about fixing the marriage anymore, or even what he wanted to do about anything. Marriage counselling failed as he wouldn't talk.
So for the last year I've been building a new happier home for me and DC. I am fortunate to be able to support us well. But I am racked with guilt and have recently begun to ask Ex to spend more time together as co parents. We had Christmas together and the occasional evening where he will come to my place to spend time and have dinner with DC and I. We have never discussed again the separation and I've been terrified to file for divorce. I booked this week away for a holiday and asked Ex if he wanted to come along which he agreed. We agreed we would have a chat about the future of co parenting and the "relationship" whilst away. So far he's mostly gone along with things but ignored me mainly. We tried to talk last night and he made clear he was happy to spend time together "as long as to keep DC happy". No mention of his feelings or mine or anything about the separation or what next. I feel the discussion should be getting closure on ending the marriage or any chance of reconciliation and then agreeing what co parenting looks like. I will say that I still do 90% of everything for DC and he will do stuff but only when asked, including child maintenance. He obviously loves for our DC but I wouldn't say overly so and mostly he's a very selfish man with very little ability to do much for other people, much less himself.
My heart is breaking again for me and DC. I will admit that all I want is a happy family. My guilt at leaving is messing with my boundaries. I'm at risk of raising my own and my DC's expectations and torturing myself. I don't know what to do.