我爱你浮浮沉沉终不忘我爱你温柔似水终不悔
[wŏ ài nĭ fú fú chén chén zhōng bù wàng wŏ ài nĭ wēn róu sì shuĭ zhōng bù huĭ]
The phrase conveys the feeling of loving someone through good and bad times without forgetting it and loving their gentle heart, which one will never regret.