If a guy doesn’t like me, why would he secretly stare at me from afar (my friends noticed) and his friends would act weird?

I messaged him and he was very friendly in the beginning and replied immediately. However as soon as I mentioned my suspicion that he wanted to talk to me due to the (sometimes more sometimes less obvious) staring he went from friendly to arrogant and said he was never interested in me at all. Would someone really go out of their way to stare over the course of years just to tease me without being interested?

If a guy doesn’t like me, why would he secretly stare at me from afar (my friends noticed) and his friends would act weird?
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