How to keep from messaging him 😭

We were together a little over four years. For the past year I haven’t been happy. He completely changed as a person when our first son was about 6 months old (November of last year) and while I’m still completely and madly in love with him, I cannot continue to allow myself to be put on the back burner and disrespected. I’ve tried telling him how I feel sooo many times, and having mature sit down conversations but due to his immaturity (22 now, 18 when we got together) and what we believe is ASD, he just cannot/will not communicate openly. I’m currently pregnant with our second son and I’m doing what I wish I would’ve before I fell pregnant again and demanding the respect I feel I deserve, and consistency. I finally just “told him off”, blocked his phone number and changed my Apple passwords so he cannot see my location or make my find my iPhone alarm go off. He has since logged into my Snapchat 2 times, & when confronted, he said there was no other way to contact me (although I think he was looking to see if I was talking to any guys, which I haven’t). I decided it was best for the boy’s to not have him blocked and told him if it was regarding the boys, he could text me or call the home phone. He never replied .. and idk it just breaks my heart. Having him blocked is less tempting but still it’s not hard to just unblock him back ... How did you move on from your child’s father? I just feel so lost .. I miss my best friend so much but he hasn’t been himself in so long. I’m just trying to stay strong for my son but I want to just cry and sleep all day tbh. I just go through ur pictures and videos (all 500 of them) over and over which I’m sure isn’t helping but I CANNOT bring myself to delete them in hopes that one day we will mend things as his parents did (divorced for 7 years due to fathers alcoholism, mom remarried but divorced, dad got sober and they’ve been together and happy since.) Or maybe at least to have photos to show our boy’s when they’re older. I thought I had been “heartbroken” before but nothing and nobody compares to this man.. I wish I could’ve met him sooner, loved him harder and cherished it all more before it got bad.