吻过他的唇却不是他爱的人
[wĕn guò tā de chún què bù shì tā ài de rén]
Meaning 'I kissed his lips but I was not the one he loved,' which reveals a story of heartbreak and being an unwanted third party in a romantic relationship. The user might feel sad and insignificant because of the unreciprocated affection.