不在乎天長地久, 只在乎曾經擁有 英文係咩??

I don't care we will be forever , I just care about I ever had it.
hope I can help you =)

just say "the length doesn't matter"
it should be fine.

不在乎天長地久, 只在乎曾經擁有

Did not care about for ever and ever, only cares about once had

好浪漫~~