Why would my crush do this?

me and my crush are just classmates and not friends. he was sitting just facing me. he said something dirty to his friend while looking at me. i was pretending i did'nt hear it but i was blushing and could'nt look in his eyes as i got too embarrassed. then he smiled and changed topic to what i was studying. why did he do it?

Why would my crush do this?
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