Why did he pull my hair?

We were making out for the first time, and things got really steamy! He sucked on my lip so hard, that I woke up with a hickey. He also pulled my hair, and slapped my butt. I didn't say anything, because as I said, we got caught up in the heat of the moment, and I honestly liked it. But now when I think about it, I think that maybe it was "too much" for a first time. And it also made me wonder if he isn't violent in real life?
Why did he pull my hair?
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