我只是你曾经唯一
[wŏ zhĭ shì nĭ céng jīng wéi yī]
'Wo Zhi Shi Ni Zengjing Weiyi' means 'I was your only one in the past.' There's a poignant quality to the statement acknowledging a history between the user and someone where the bond was unique and important but has changed over time.