Why does this guy keep pursuing me after I say I am not interested in what he is looking for?

This guy has told me he is really busy and wants to hook up... Then if we end up having chemistry it can turn into something more... I told him I am not into a hook up but he keeps contacting me.. Even after we don't speak for weeks or a month at a time he will eventually email me. Why doesn't he just find some other girl who is looking for a hook up and leave me alone? Guys are so damn confusing!

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