相濡以沫却厌倦到老相忘江湖却怀念到哭
[xiāng rú yĭ mò què yàn juàn dào lăo xiāng wàng jiāng hú què huái niàn dào kū]
It means 'living together through hardship till old age turns into weariness; forgetting each other in the world but missing each other to tears.' It reflects on the bittersweet nature of relationships that can grow tiresome yet remain deeply missed when lost.