Is OTHER wrong in the post ? POST : This happened a while ago, but it's eating me inside.

I have a dog shit relationship with my parents (my mom especially). Mom is abusive and neglectful, Dad is borderline abusive and is neglectful. I'm an adult now and I don't live with them anymore, so the bad stuff all happened when I was living under their roof. Since this is about my dad, I won't go into detail with what my mom did. 

My dad denies that my mom was ever abusive and gets mad at me for making her feel bad. I have PTSD from how she treated me, and I've told him this. He doesn't care, it seems. When I got an abscess (basically a cyst on steroids), he took me to the doctor once. They didn't know the problem. The pain was so intense that moving an inch made me scream bloody murder. He seemingly didn't care and forced me to go to school every day. The only reason he called a doctor again is because I collapsed in the hallway and the school nurse noticed. He also makes fun of everything I eat, despite my constant telling him to stop. His comments gave me an eating disorder that made my BMI drop to 15. He also made weird sexual jokes and comments around me, and wouldn't let me go when hugging me and kissing my cheek.

So one terrible day, he asks me what's wrong because I'm crying in the car. After fifteen minutes of me refusing to spill it, I finally break because I want someone to cry to. I ask him if he's ever noticed how I eat in secret, don't eat a lot, how I've been getting thinner, etc. He says no. Finally it clicks and he says, "What, do you have an eating disorder or something?" I scream, "YES!" 

His response is denial because I'm gaining weight and yada, yada, yada. I snap and say something like, "this is why I hate opening up to you! You always make it worse, just like when I tried to tell you about Mom!"

Again, denial. This is where I might be the huge asshole. He's being as calm as possible while I'm screaming at him, telling him how much it hurts to not have your own father protect you from abuse, how it's like he's dead to me, how he and Mom made me want to die, how he probably doesn't care, all this stuff that would make any sane parent feel horrible about themselves. After I lose my voice, I sob into my hands and apologize for yelling. I ask him to promise me that he won't tell my mom about my eating disorder. For some reason, whenever I have a problem, my mom thinks it's an attack on her, and she goes crazy. Like, kicking open the door to the point where I think she's going to kill me crazy. It'd also give her a new thing to insult me about. He knows this.

"I can't promise that," says Dad.

There it is. I feel like he doesn't care about me at all. He's willing to throw me under the bus, risk my safety. I look at him and say, "I will never tell you about my problems ever again." He says no, it'll get better, we can talk about it, it's just a bump in the road. I shake my head and reassure him that I will never open up to him, that he's lost his chance forever. I'm sticking to my word, no matter how much of a cunt that makes me. 

Still, I feel horrible of denying him deep conversations and opportunity to help me. I honestly don't think he's malicious like my mom, but he's just apathetic. I've spent years opening up and trying to beg him for help, and it's just blown up in my face every single time. This was the final straw. Am I the asshole for giving him such a heavy blow to his pride as a parent?