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Do you think stingy people know that they are stingy?

I have no money, but I use others unequivocally. I want to use everything. If you can't take advantage of it once, you feel that others are stingy. After a long time, others will stay away from him, but he tries his best to take advantage of others. He also knows how others treat him, knows that he is stingy, and just pretends not to know.