I agree with milano, now that he knows there isn’t any consequences for striking you, he will do it again. when it happens again CALL the police. They will arrest him, then get an injunction. If he happens to post bail then he can not come in contact with you.
I am so sorry, I know how scary this is. You are not responsible for his actions. He is. I urge you to call the police for any physical action he displays. And call the DV hotline, they can help calm your nerves.
no one should live in fear.