你不是我又怎知我待他情深
[nĭ bù shì wŏ yòu zĕn zhī wŏ dài tā qíng shēn]
Translated as 'If you are not me, how would you know how deeply I loved him?', this reveals a feeling of being misunderstood. Emphasizes deep emotions felt towards someone, believing only the person themselves fully understands those depths.