Move on, you don't have to stay with someone who doesn't make you happy
If you are not happy which sounds like is the case it's time to move on. Good luck.
Well, you probably shouldn't have had a child with him in the first place, since you aren't even married, But besides that, do you care more about your happiness or your child's happiness of having a family. Divorce or separation takes a harsh toll on a child, and they will probably resent you or their father at some point of their life. And arguing is a part of marriage. Life is tough, and marriage sure ain't perfect, but it's up to you.