What is the saddest sentence in Jin Yong's novels?

"This is a folk song in Fujian, which was taught to her by Brother Lin!"

I love you, I am affectionate, but your heart is like stone, and you are gone in a blink of an eye.

Ling Huchong was trapped on a cliff, and he could only look at Younger's eyes full of Lin Pingzhi, unable to recover. The saddest thing in the world is not that I love you, but that you love him, but that I know you will leave me, but there is nothing I can do.