Why is this guy poking me in the ribs all the time now?

KaylaGirly101
He's my brothers friend, I'm kind of friends with him too, we don't spend much time actually us hanging out though. Only at home. So anyways, a week ago he started poking me in the ribs (not painfully hard) a couple times when he was over. He did it again a couple days later when we were at home. He comes up behind me and does it. It's in my upper ribs a time or two near a certain area. My brother was with us though...like 15 feet away? He did it again probably two or three times within an hour. Then at school when it was lunch time I was eating with my group when he did it again. This time my brother wasn't there. My brother doesn't say anything when he sees it (I'm not sure if he sees it at home) so later on when I was at home (without the guy) I asked my brother why he did it...he says he doesn't know. My brothers x-gf told me that he told he likes me (this was a few months ago) and when she tried to get him to ask me out, he claimed that he didn't like me (I was there this time).
So why is he doing this? He's 14 and I'm 13.
Why is this guy poking me in the ribs all the time now?
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