Guys, Why did my boyfriend slap my butt after lunch today?

Anonymous
So today after lunch, on our way to our 3rd hour class, he slapped my butt. I had said "My butt is off limits" and he said "I guess". I asked him why he did it and he said I was slow. I said "So what?" and he told me straight up "Horse riders slap their horses butts to make them walk faster" but besides the point, why did he slap my butt? He's never done this but he has put his arm around me or looked down my shirt a few times I guess. What does it mean? I don't care if I'm almost 14, I want to know why.✌ Thanks to anyone who answers!👌
Guys, Why did my boyfriend slap my butt after lunch today?
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