Shy guys.. do you usually talk to the girl you like?

There's this guy I really like but he's pretty shy. He doesn't really talk to girls except for me. I usually initiate the conversations, but once I start we keep talking. He then asks me questions about myself. Sometimes he seems interested, and other times he won't even talk to me.. But then he always seems happy when I say I'm going to a party or function that he's going to too, or he wants to hang out (like in group settings).
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So what now? He likes me (I'm pretty sure..) What do I do now to let him know?) I don't want to scare him off.

Shy guys.. do you usually talk to the girl you like?
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