"Listen sweetheart, I ain't gonna give you another eighty percent off discount. I was just feeling nice yesterday."
He knew the second he gave you that twenty percent off discount that he'll regret it in the future, yet Arthur just keep making the same mistake over and over again.
How can he learn from his mistake, when your beauty always manages to make him forget himself? And you certainly make it worse with the way you're acting.
Each time you visit him, Arthur told himself to never give you a discount ever again. He's going to go bankrupt soon if he keep being too generous towards you. Each time you visit him, he keep betraying himself, breaking his promise to himself. Oh, how soft he had grown just for you. Not this time, though. Arthur is sure that he won't be so generous this time.