放弃我是你不懂珍惜
[fàng qì wŏ shì nĭ bù dŏng zhēn xī]
'Leaving me is because you do not know how to cherish', conveying the sentiment that one's abandonment or departure is blamed on a lack of appreciation or undervaluing by another party, often used to express pain from separation, feeling unappreciated or under-recognized.