(Why) would a straight guy always stare at a particular good looking guy?

My crush stares at me and also at a male friend in college (we don't hang out together on campus so he doens't know that we know each other). I know that he had a crush on me but he always says that he is straight. Why does he stare at my guy friend then?

(Why) would a straight guy always stare at a particular good looking guy?
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