Would a man try to make me his side girl by becoming emotionally attached to me? Isn’t that counterproductive?

Woildnt a man try to manipulate me into loving him, while staying detached himself?
someone said it sounds like this guy I know wants to make me a side girl but HE seems like he’s sweet on me. Even when I try to distance emotionally from him, he notices and he seems hurt. Guys I’ve dated haven’t even seemed hurt by me before. I definitely wasn’t expecting this I thought he would just move on and forget me easily. But it feels like he likes me and I don't know why. Cause he has a girlfriend.

Would a man try to make me his side girl by becoming emotionally attached to me? Isn’t that counterproductive?
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