你说你爱我爱我凭什么说
[nĭ shuō nĭ ài wŏ ài wŏ píng shén me shuō]
'You say you love me, why should I believe?' This conveys skepticism and questioning of sincerity behind declarations of love. It could imply past experiences have led to wariness or disbelief when told 'I love you.'