It is better to forget each other than to care about them. It's an idiom in China, which means that in the spring drought, the fish's saliva moistens each other, so why not go to the rivers and lakes separately for more freedom. Metaphor is to help each other with meager strength in difficult situations; Sometimes you might as well give up your persistence and welcome the world with a brand-new self.
From Zhuangzi's Inner Chapter, Master, and Zhuangzi's Outer Chapter, Destiny.