情到深处终成伤爱到深处终难忘
[qíng dào shēn chŭ zhōng chéng shāng ài dào shēn chŭ zhōng nán wàng]
The deeper one feels love or an emotional connection, the more likely that separation leads to pain, and those feelings are unforgettable. This reflects the intensity and longevity of deep emotions, which might turn sorrowful but never fade.