不能说深爱就别久伴
[bù néng shuō shēn ài jiù bié jiŭ bàn]
It signifies that if you can't say deeply love each other, there's no need to stick together for long. The user may be implying a belief about relationships - without deep affection, people should let go of each other in due time rather than holding on just for the sake of it.