Why hasn't he accepted or declined my follow request?

I followed this guy on instagram but he hasn't accepted or declined! He's accepted someone else's request except for mine and has already followed a bunch of people. There is something definitely between us because he's always staring from afar, touching his lips when i'm near and fully avoids eye contact when I come past! (There is a 4 year age difference!)
Why hasn't he accepted or declined my follow request?
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