深爱之人并非久伴之人
[shēn ài zhī rén bìng fēi jiŭ bàn zhī rén]
This translates to 'The one deeply loved is not necessarily the one who stays for long'. It conveys a somewhat sorrowful understanding that intense romantic feelings do not guarantee enduring companionship. It touches on the reality that love does not always equate to longevity in relationships.