别用你吻过别人的嘴说爱我
[bié yòng nĭ wĕn guò bié rén de zuĭ shuō ài wŏ]
'Don’t say you love me with those lips that have kissed others,' revealing betrayal and hurt because the person uses their lips (symbol of truth/loyalty) to lie, showing lack of integrity especially in matters of the heart.