Guys, Why would a guy talk to everyother female in our class comfortably but not me, and he never initiates a conversation even if we're alone?

I'm 23 years of age and his also 23 years of age. We're both in the same college class, he has a girlfriend. Sometimes our interactions are awkward.

Guys, Why would a guy talk to everyother female in our class comfortably but not me, and he never initiates a conversation even if we're alone?
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