分开是彼此的阶梯相爱是彼此的枷锁
[fēn kāi shì bĭ cĭ de jiē tī xiāng ài shì bĭ cĭ de jiā suŏ]
The phrase indicates the view that separating might help both parties grow and progress in life ('being steps for each other'), while staying together out of love could bind them and hold back personal development ('becoming chains for each other').