Why does he repeatedly glance at me for a few seconds and then look away during lectures?

Anonymous

A fellow student of mine used to have a crush on me 4 years ago but lost interest fairly quickly. Yesterday I saw him for the first time after 2 years of online school and he would always turn around to glance at me for 4 seconds. Why did he do that if he is not interested? He was never in a committed relationship and never approached me.

Why does he repeatedly glance at me for a few seconds and then look away during lectures?
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