别用吻过她的唇的嘴说爱我
[bié yòng wĕn guò tā de chún de zuĭ shuō ài wŏ]
It translates directly to 'don't say you love me with those lips that kissed her'. It's a deeply hurt statement conveying that the speaker doesn't trust the lover's words because they believe that this lover was also intimate with others, reflecting jealousy and lack of trust in a relationship, maybe even past trauma from betrayal.