你的愛建立在我的痛上你的情生長在我的心上
[nĭ de ài jiàn lì zài wŏ de tòng shàng nĭ de qíng shēng cháng zài wŏ de xīn shàng]
It describes how your joy comes from hurting me, while my sorrow grows deeply within myself - an intense feeling where one feels used and left with emotional scars.