What was the root cause of Mei Changsu's tragic life?

Mei Changsu was a fictional character. His story background and character existed in novels or television dramas. Therefore, the root cause of Mei Changsu's tragic life might have been set by the author or screenwriter. In some novels, Mei Changsu may be a smart and talented character, but because he was too arrogant and unwilling to accept failure and mistakes, he eventually lost many important opportunities and people's trust. In other novels, Mei Changsu may be a character with a complicated background and deep emotions, but because he was too cold and selfish, unwilling to give up his own interests for others, he eventually lost his own happiness and love. The root cause of Mei Changsu's tragic life may vary from person to person. It needs to be analyzed according to the plot and character setting of the novel or TV series.