放弃了就不该后悔失去了就不该回忆
[fàng qì le jiù bù gāi hòu huĭ shī qù le jiù bù gāi huí yì]
Translated, this implies that one should not regret after having given up and should not dwell on things already lost. It’s an expression about accepting decisions made and moving forward without being held back by regret or memories.