待你说爱他时我已输的彻底
[dài nĭ shuō ài tā shí wŏ yĭ shū de chè dĭ]
Translated as 'By the time you tell him you love him, I've already lost completely.' It reflects feelings of loss and defeat upon seeing a loved one move on or declare their affection for another person, signifying a sense of helplessness and acceptance in letting go.