回首品你心中那仅有的情
[huí shŏu pĭn nĭ xīn zhōng nèi jĭn yŏu de qíng]
This conveys a deep, lingering sentiment of revisiting and reminiscing over the only true feeling left cherished within the heart about someone else, suggesting nostalgia for what could've been or still exists as a cherished memory.