He talks to me online ... but not in person; does he likes me?!

I see him, he's a friend of my close cousin. But when I actually see him in person he LITERALLY blanks me, he doesn't even look or answer when I talk to him - but he added me on fb and whenever we're both online he alwaaaays starts a conversation and asked for my MSN and he talks to me like I actually know him. But does he like me or is it something else? also, he's a teenager like me.
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When we talk he asks me about random stuff like; why did you do that, why did you go there, how come you did that ... and he asks me if I talk to guys and stuff about guys, if I do stuff with them and all that...
He talks to me online ... but not in person; does he likes me?!
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