If a guy is always hitting me, pinching me, poking me, and just in general playfully bothering me?

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and he says he doesn't know why but he enjoys bothering me, and it makes him feel good to bother me..what does this mean in a guys opinion? We are both 21 and very good friends, but a long time ago when he liked me I wasn't interested and a few years ago when I liked him he said I'm not his type... when a guy says that can it change?
If a guy is always hitting me, pinching me, poking me, and just in general playfully bothering me?
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