Why would a guy not be interested but stare at me a lot?

there’s this guy who i find rlly cute except he’s a year older than me. i asked if he’s interested and he responded w “fuck no” after that tho i kept noticing him staring at me a lot. every time i look in his direction tho he looks away. what is that supposed to mean?
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Why would a guy not be interested but stare at me a lot?
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