It means that he wants to forget everything before and be single again, or he must change his sad head and say a sad word to arouse everyone's sympathy for him, so that he can find a girl better in the future. Or change an avatar, in other words, if everything feels like a new beginning, let everyone know that he broke up, let everyone see that even if he broke up, in order to be full of hope, he still wants to create a strong image, so that all the girls in his circle of friends think that he is great and excellent, so that he can seduce his sister with his love rat method in the future.