How to treat Guan Yu's defeat in Maicheng in the Three Kingdoms?

I think Guan Yu's failure in Maicheng has a lot to do with his own character. Character is fate. Guan Yu was extremely conceited all his life. Guan Yu's conceit not only ruined himself, but also ruined Zhuge Liang's whole strategic plan. Shallow and heartless is also his achilles heel. Compared with Sima Yi, Guan Yu's psychological quality is extremely poor. Sun Quan proposed to his son, and his marriage was free. Even if I don't marry, he actually said that my tiger girl is willing to marry your son, which hurts.

Courage and loyalty are not enough, so we must find another way. So Guan Yu's advantage of being good at speculation is even more obvious. Guan Yu and Zhang Fei were the first to follow Liu Bei, but Guan Yu was not as reckless as Zhang Fei and often contradicted Liu Bei. He knew that Liu Bei was the supreme ruler of Shu, so he wouldn't worry about being promoted to a higher position. So he followed Liu Bei's instructions and firmly supported him. Liu Bei's instructions ordered him to obey unconditionally and carry it out to the end, and he has always been a "big brother". "Big brother" is short, but fortunately he is loyal to Liu Bei after his predecessors. Liu Bei also reciprocated. First, Guan Yu was sheltered from the severe punishment of Huarong Road, and Cao was released. Later, Guan Yu was urged to be the commander of Jingzhou Military Region. So who dares not flatter Guan Yu when selecting the "Five Tiger Generals"? Therefore, Guan Yu's ability to take credit is obviously higher than his own Zhang, Zhao, Ma and Huang, ranking first among the "Five Tiger Generals". Zhang Fei and Zhao Yun have great opinions, but they are helpless. Worst of all, with the popularity created by Romance of the Three Kingdoms, Guan Yu finally got mixed up with the titles of "Great Conqueror" and "Guan Fuzi", which was widely admired by later generations, and it can be described as infinite scenery. If Guan Yu has a spirit underground, I really should thank Luo Guanzhong. Unfortunately, after a long struggle, Guan Yu finally failed to live up to expectations, lost Jingzhou and hurt Shu Han. This is the evil result of knowing that you can't do it, but you are reluctant to do it.

How could such Guan Yu not fail in Maicheng!