原来我只是一厢情愿
[yuán lái wŏ zhĭ shì yī xiāng qíng yuàn]
'yuanlai wo zhi shi yi xiang qing yuan' expresses the discovery of a one-sided relationship; realizing your emotions were not reciprocated. This is the moment when you find out that the affection was merely yours own wishful thinking instead of shared.