Guy won't follow me back on instagram?

Anonymous
He always stares at me and either looks away really fast or keeps looking into my eyes. When I talked to him he couldn't look me in the eyes... And the other day I was laughing at something and he looked over at me and smiled when I noticed he looked away and touched his hair... And today my friend noticed him looking at me a ton and when he saw my friend notice that she saw him looking at me he looked away. He's following that friend on instagram but not me?
Guy won't follow me back on instagram?
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