若爱你是病我愿放弃治疗
[ruò ài nĭ shì bìng wŏ yuàn fàng qì zhì liáo]
Means 'if loving you is an illness, I am willing to give up treatment.' This expresses the extremity and depth of unrequited or tumultuous love, where the lover might feel that loving another has caused more pain than joy.