This is actually very understandable, and as far as I know, not uncommon; I know several people who have developed crushes over the internet.
It is very possible to fall for someone who you've only talked to on msn or texted or whatever, because even though you've never met them you feel like you know them, and they know you, and that you understand each other, and a crush can come from that. And also you've seen each other on cam, so theres probably a physical attraction there too.
As for him changing since you told him you liked him, he probably just feels awkward... this is common when someone develops a crush on a friend, and the friend finds out, especially between 2 males (I'm assuming you're male because you mentioned he's bi curious?).
Anyway, thats my theory... hope it helps.
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