Why does this guy talk easily to all girls but me?

Cookiejar33
He interacts with all the girls of the class easily, is kinda outgoing but when it comes to me he becomes awkward. Avoiding eye contact, becoming clumsy. I tried to talk to him a few times, he was very shy and last time he quickly escaped.
But he keeps staring at me from afar and also always smile at me when we cross each other.
Why does this guy talk easily to all girls but me?
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