Do personal trainers purposely flirt with you to gain business?

I've joined a new gym and met my personal trainer that I will be starting with in a few months (as I'm going away). Immediately when he saw me, he was looking deep into my eyes with this huge smile. I had to put down my number and the next day he texted me asking how my day is going, when I'm going to be back from holidays to start my pt sessions.
Do personal trainers purposely flirt with you to gain business?
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