I come across the following sentence in "The Godfather" by M. Puso:
Michael sat down and relaxed back into the leather armchair. Hoe thought everything over very carefully. Clemenza was a caporegime in the Corleone Family structure. Don Corleone had made him a millionaire and they had been intimate friends for over twenty years. He held one of the most powerful posts in the organization. What could Clemenza gain for betraying his Don? More money? He was rich enough but then men are always greedy. More power? Revenge for some fancied insult and slight?
My question is what does the last sentence mean? How could fancied insult and slight ever be related there?