只要你不放手爱你很久很久
[zhĭ yào nĭ bù fàng shŏu ài nĭ hĕn jiŭ hĕn jiŭ]
As long as you don't let go, I will love you for a very long time. This expresses a strong, enduring commitment in a relationship, indicating willingness to stay no matter what happens if the other person stays as well.