What would you like to see and/or hear in this situation?

Me and my boyfriend of almost three years are having a baby and are currently going through a bad time. Over the years we have had an on-off relationship due to him being avoidant and me being anxious. very much push and pull. We gave each other a month break which originally was going to be a permanent break but we ended up missing each other and deciding to try again. Not long after we conceived what is now a 2 month old fetus.
We started fighting a lot more when he moved in and in my eyes I saw it as I was being neglected. In reality I was so stressed and overthinking that I wasn’t appreciating what he was doing. He was helping around the house a lot and I would thank him but i would still find something to complain about. He was always the one leaving the relationship because he didn’t want to fight anymore. I don’t want to fight either, there’s clearly something I need to work on. That i a working on.
We talked days after a big fight and he decided he no longer wanted a relationship with me because he didn’t believe things would get better for us. But that he will be there for the child. I asked to have lunch with him tomorrow because i really want to do something about this. He hasn’t moved out yet but i know it might come soon.
I’m so scared of losing him. He’s my best friend and i love him so much. I hate myself and my poor choices. What would you want from me if this was you? What do you guys think I should or could do to try and salvage our relationship? I know in the end I can’t make him do anything. I’m just looking for something I can do to show him how much he means to me and in hopes of repairing this