我早已遍体鳞伤你却不知
[wŏ zăo yĭ biàn tĭ lín shāng nĭ què bù zhī]
The meaning of it is that 'I have been hurt all over the body but you haven't noticed.' It implies a feeling that despite experiencing countless pains and sorrows secretly in mind, there isn't any other one that notices his/her pain, expressing disappointment in close ones or love interests.