Why is he so attached to me when I already told him I‘m only interested in being friend with benefits? Does he want more out of me?

My boss and I currently seeing each other. We both work first shift in healthcare, but sometime he would go home with me telling his wife that he has to cover second shift. We are only friend with benefits but I think he is really into me.

Why is he so attached to me when I already told him I‘m only interested in being friend with benefits? Does he want more out of me?
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