曾经以为天长地久
[céng jīng yĭ wéi tiān zhăng dì jiŭ]
It translates to 'once thought it would last forever.' This name expresses reminiscence about a past belief in the longevity or permanence of certain things or relationships which didn't actually last. This kind of regretful reflection is poignant and often found in reflective contexts, lamenting the passage of time or lost faith in eternal bonds.