Why is my gym trainer giving me free sessions?

My sessions have been over but he's still giving me free sessions. He flirts with me, is always smiling and laughing when he's with me, keeps staring at me a lot, touches me quite often and has even insinuated that he wants to have sex with me. Also, he always hangs around after our sessions to talk to me for a long periods just asking me personal questions, telling me about his life etc.

Why is my gym trainer giving me free sessions?
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