Do you think this guy at my job is flirting?

I am a housekeeper (summer side job) at a Yaht club and ofc I check everything to make sure it’s clean and filled.

I check the gym room and sometimes there is a personal trainer on duty. I don’t see him often. Sometimes when I pass by he looks.

I went to collect some trash that was getting full. He was training someone and talking with him. While I was getting the trash he was looking and said “thank you for doing that for us”

he was looking and he had a smile. He could just be friendly.

Do you think this guy at my job is flirting?
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