After Xiang Yu's death, why did Liu Bang cry at his grave? Is this a performance?

Whether Liu Bang's behavior is a show or not can be interpreted from two levels. First, from the king's point of view, Liu Bang's crying in front of Xiang Yu's tomb was not a show. The reason for saying this is that Liu Bang has won the world at this time, and then his power has reached a peak. So in this case, Liu Bang may have a feeling of detachment. After all, he used to find some happiness by taking Xiang Yu as his opponent, but now that Xiang Yu is gone, he will be more or less lonely. Secondly, because Xiang Yu and Liu Bang have been entangled for most of their lives, they can be said to know each other best, and the long-term struggle has also made them have deep feelings. In the present words, they were bosom friends of each other, and then Liu Bang won the struggle because of his different positions. Now that Xiang Yu is gone, Liu Bang will naturally think of Xiang Yu, and then it is reasonable to cry at Xiang Yu's grave. Second, from the perspective of ordinary people in the world, his behavior is just a show. In fact, the purpose is also very simple, that is, to let the world see that Liu Bang is not a narrow-minded person. Although I have a deep hatred with Xiang Yu, now I have put all these deep hatred behind me and rushed to Xiang Yu's grave to cry bitterly, so for those ordinary people, you should be glad to have such a broad-minded king. At the same time, Liu Bang's practice is also intended to tell the founding fathers that as long as you are honestly loyal to me and don't think about those who have nothing, I guarantee that you can enjoy the splendor for the rest of your life. After all, I was so kind to my former enemy that I cried at his grave, so the treatment of you founding heroes will definitely be better.