Why would a guy ask to have sex with you when he’s dating someone else?

A guy who I was seeing on and off for a while (i stopped the situationship) asked to see me to have sex, he told me he’s dating someone over 100 miles away and I said no as he was dating someone.

why would he ask to have sex when he’s dating someone else? Surely he can’t like her that much? And why would you date someone so far away?

Why would a guy ask to have sex with you when he’s dating someone else?
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