What would you do

A little back story. My ex husband is the definition of a narcissist, can’t keep a job, everyone’s wrong except him, has no friends and serious controlling manipulative issues. Goes on rants, finds someone to hone in on and take his problems out on and gaslights anyone close to him. He would tell me that me and our daughter ruined us life called her “it” or she was just “my child” and not “ours” and I finally left and moved back home across the country with her when she was ten months old. He sees her every 6 months for a weekend with his mom so he doesn’t have to take care of her because it’s “too much” he’s 30 btw. I don’t ask for a thing because it’s not worth it. Our daughter is now almost two and I’ve moved on and am 32 weeks pregnant and in the best relationship I’ve ever been in. The problem is my ex constantly texts me that he misses us (me and our daughter). If I respond that it’s inappropriate for him to text me those things the conversation gets turned on me and how I messed up our family ( you know the one he didn’t want) and will send me pages and pages because he has nothing better to do. If I don’t respond then he says I’m not promoting a healthy relationship as our agreement states. What would you do?