Why does he keep telling the same lame joke?

Js24567

I go to a local store to pay my credit bill there. At the store is a nice looking guy who seems very outgoing. Everytime I go to pay my bill, he is at the counter where I have to pay it. Everytime he tells me the same joke. I pay with cash and he says can I have a few of those hundred dollar bills. Most times I just laugh and blow it off but today I pushed back and jokingly told him that he should pay me when he gets paid since he gets paid sooner then me. I told him I would come in and he could give me money on his payday. He replied with sure that would be fine, but he looked at the floor when he said that. I don't get why he always comes over to where I am paying my bill and says the same joke Why does he do this?

Why does he keep telling the same lame joke?
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