Was my guitar tutor flirting? if not, what was it?

my guitar teacher was staring at me during the whole session. not in a creepy way, but i felt like i was the only thing he could look at. and it was pretty noticeable. I'm 16 and he's in his 20s so I don't think he was flirting. but what was it?

Was my guitar tutor flirting? if not, what was it?
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