What does it mean when your fitness trainer is flirting with you?

He is only smiling at me when i am in a group once said my name while talking to someone else whose name isn't Marianna.. He confused our names lol... He was looking at me at that moment.. He is also very attractive!! I want to flirt back but am very shy... what should i do?

What does it mean when your fitness trainer is flirting with you?
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