My boyfriend slapped my face during sex

So, I remember one time we were having sex at his place and afterwards, he told me “I don’t know why, but during the act I felt like I had the need to punch you in the face”. And I looked at him like wtf dude. And I was like “nooo that’s not something you do hehe”. We watched the californication episode where the girl punches the guy in the face and suddenly he wanted to do that??

A couple weeks after we were having sex and OUT OF NOWHERE he slaps me on my face without previous warning or anything. It was a ‘soft’ slap, I did nothing, but it was unexpected. I was like wtf in the moment but I didn’t say anything to him. And it was so fast and afterwards he put his hand like a fist 👊 and put on an ‘angry’ face, like he was going to hit me with his fist!!!! But he didn’t. It was like he threatened to hit me but he didn’t. And I tried to forget about that.

The next day I felt ‘nasty’ or ‘dirty’ for that. Like I deserved it?? The thing is, I’m into choking, so maybe he thought I was going to be into that? But I don’t know. I’m into light choking, sometimes he puts his hand on my neck but because I allowed it.

But I don’t know. Should I leave him? Is he violent?