知道你不爱我却依然执着知道你不想我却还是难舍
[zhī dào nĭ bù ài wŏ què yī rán zhí zhe zhī dào nĭ bù xiăng wŏ què hái shì nán shè]
It expresses deep affection where one person continues to care even though they know they're not reciprocated. They can't let go despite knowing their feelings aren't returned