爱你天长地久疼你地久天长
[ài nĭ tiān zhăng dì jiŭ téng nĭ dì jiŭ tiān zhăng]
Expresses the wish for eternal love and care to someone, emphasizing the depth and duration of feelings towards another person - loving you forever and taking care of you endlessly. It indicates unswerving affection that stands the test of time.