我的坚守却守不住你的心
[wŏ de jiān shŏu què shŏu bù zhù nĭ de xīn]
I've been persistent but failed to retain your affection. It conveys persistence yet unfulfilled desire to keep the attention or love of someone else's heart despite efforts made, suggesting frustration towards the other party's lack of reciprocation or waning interest over time.