Disrespectful baby daddy and not sure about baby’s last name🤦‍♀️

My baby daddy is so disrespectful to me. I’ve done nothing to him. He begged to be in a relationship with me and then left shortly after we found out I was pregnant. Today he text me and told me I’m single because I was a bad girlfriend and I’m even a bad person. But he couldn’t explain. Like I said I’ve done nothing to him. We were completely fine the day before he broke up w me and he took me and my son to his grandmas house. Then the next day randomly broke up w me and started hitting up his ex. (I just turned 19 he’s 22 btw) also he would get weirded out any time I sent him any updates on the pregnancy or mentioned the baby. He’d tell me “chill”. I’m 14 weeks now. After he was being rude to me today I blocked him off messages so he dmd me on insta a ss of the rest of the messages he was sending me and I noticed he changed my name in his phone to “baby mama🖕🏻”. I feel completely disrespected and don’t want him anywhere near me this pregnancy or even in the hospital unless he was to change. I don’t deserve this. I’ve already went through this with my first baby daddy and I wish I would have just kept him blocked my entire pregnancy. I don’t want to give this baby it’s dads last name. Due to the immaturity and disrespect on his part. He’s done nothing to help and is just plain rude. I need opinions!