Why would a guy do a double-take, stare at you for a few seconds and then walk off?

Anonymous
So there's this guy at University. He will sometimes look up at me from the corner of his eye, with his head tilted and then smile but won't say anything other than "Hi" but he can talk just fine with other girls.

Recently, it's happened a few times now, he will be walking past me or down the corridor, he will notice me, carry on walking and then stop just to come back and look at me again and then he will walk off!

Is he playing games with me?...I'm so confused by him!
Why would a guy do a double-take, stare at you for a few seconds and then walk off?
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