1. First of all, Xiaofeng's relatives, all those who loved Xiaofeng, are dead, and they are no longer with her. No one can care about her and love her. All the people she loved were killed by the people she loved, so it is very painful for him to live in this world. Before Xiaofeng forgot Sichuan, she witnessed her own Weng being killed by her favorite person. She couldn't accept it at that time. Later, after forgetting Sichuan, she married Li Chengyin, but at last she remembered it. This is a double blow, which makes her even more unable to accept this fact. Later, Adu, who had been with her, died in her hometown, and Xiaofeng couldn't stand it anymore. Her relatives and friends have left him, and she is alone in this world.
Secondly, Xiaofeng can't accept that all her lovers were killed by Li Chengyin. Rather than saying that she can't forgive Li Chengyin, she can't forgive herself. She thinks it's all her own fault. If Li Chengyin disguised as Gu Xiaowu had not been brought back to Dan before, Dan would not have died, Weng would not have died, and the Western Zhou Dynasty would not have become this situation. If she hadn't fled back to the Western Zhou Dynasty, her brother wouldn't be so desperate to fight Li Chengyin, which would lead to an impending war. She knew that the war could not stop until she died, so she chose to die without hesitation.
Finally, if Xiaofeng chooses to live in this world, the Western Zhou Dynasty and the Li Dynasty will go to war. How does she face her native land of the Western Zhou Dynasty, and how does she face Li Chengyin who loves her bone marrow? She can't love and wait, so death is her best relief.