What are the similarities and differences between Liu Bei and Guan Yu's loyalty and trustworthiness?

For example ... the first time Liu Bei cried was when he wandered around the country, became attached to Liu Biao in Jingzhou, and talked about family affairs with Liu Biao through light wine. He felt that he had lost his life and failed to make a career, and he felt a sense of vicissitudes. At this time, Liu Bei shed tears, really tears. Liu formed an iron block. No matter when and where the political situation changes suddenly, this iron knot has never rusted and deteriorated. The three iron brothers established their political power by faith and courage, and only Liu Zhang enjoyed it alone. Liu Zhang, who is faithful, righteous and benevolent, has never given up the blood feud. It is true that Zhang Fei was brutally whipped at the end of the expedition, but he was killed in the end. When the bad news came, Liu Bei fainted from crying. It can be seen from Liu Bei's real crying that Liu Bei, as an ordinary person, is kind and kind, but as a political figure, it is not easy to do this.