My boyfriend slapped me during sex?

I was on my back, him fingering me then he slapped me in the face a few times and I was really confused but didn't show bc I didn't wanna ruin the moment. Now I'm just thinking wtf was that, I never knew that was a thing people are into, and I don't know if he even likes me now. I mean, why would u slap someone u love? And why didn't he ask beforehand if it was alright. We had an argument the day before, was he just taking anger out on me? I'm so so confused that's never happened before.
My boyfriend slapped me during sex?
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