Why does he constantly come around just to ask for nudes?

A guy that I barely talk to much anymore texted
me out of nowhere, and said "miss you", and
shortly after asked me to send him nudes like
before. I didn't send him any, and tried to give him
a hint. But he still comes around and tries to ask
or inquire about the old nudes that I deleted in the
saved chats on snapchat. Why does he think I'd
still send him anything after that one time?
Why does he constantly come around just to ask for nudes?
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