忘得了忘不了的都会离开分不开分得开的都会分开
[wàng dé le wàng bù le de dōu huì lí kāi fēn bù kāi fēn dé kāi de dōu huì fēn kāi]
'What can be forgotten will be gone, what cannot be left behind eventually parts ways; what must separate inevitably does, no matter whether easily or hardly.' It expresses an attitude towards transient encounters and relationships, implying all connections, remembered or forgotten, eventually come to an end.