Anyone experience this?

Okay a little backstory: my boyfriend and I were together for 8 months and we got pregnant. Once I got pregnant, he became extremely verbally abusive. I’ve never heard words like that said to another person in my life. It was horrible. I should have left right there. I ended up in the hospital around 38 weeks due to crying so much from his abuse. I have it all on recording. Once our son was born, he got a little better. He no longer yells at me but he is always miserable, and will still get mad at me over nothing. (Example: I didn’t write a Facebook post until 11am on his birthday and that wasn’t early enough so that turned into a huge fight and him telling me off). Anyways, I’ve told him SO many times I’m unhappy. Out of the 25 times I’ve told him, 22 of those times, he will act like it’s the first time he’s ever heard that before. The other 3 times he would beg for me to not leave him and he would change. And I stupidly always accepted. I told him last night I was unhappy and he acted like I never told him that and how could I do this to him. I had to work last night so I texted him asking where he was because I had to work and if he could watch our son and he told me “you broke up with me now you need me?” Just dumb things like that. I don’t know how much more I can take. I don’t want to leave because I don’t want my son going to him on weekends without me. I don’t trust him. His personality is horrendous. Anyways, the whole point to my post is: I have zero emotions. I used to cry over everything and I NEVER cry anymore. I haven’t cried in at least 9 months. I have no emotions or feelings towards really anything. Is that a normal thing to happen? I feel like a sociopath. I can’t feel anything I’m basically numb. Ugh! Thank you in advanced.