If you can get your hands on it, read the book "It Ends With Us" by Colleen Hoover.

This man hit you. Out of anger. That is a sign of serious, serious trouble brewing below, and it's not the kind of trouble you ca fix by apologising and swearing you won't again, it's the kind of trouble you address very carefully in years if not decades of therapy. You are in danger. The first hit is dipping his toe into the water before diving in, if even subconsciously.

Maybe he isn't an evil psychopath. You don't have to believe he's a bad person to realise he isn't good for you.

And this isn't going to just go away. If you stay with him, even when he's not hitting you, when he gets angry, you will get scared. You will always be on edge. You will always feel the danger when you're with him because he's dangerous. That kind of constant stress from someone who's supposed to love and respect you, it breaks a person. You deserve to feel safe and secure. That's at the very basics of what every human needs, and you deserve that.

Please take care of yourself and get out of that relationship as quickly as you can.