当初生死相依变陌路人
[dāng chū shēng sĭ xiāng yī biàn mò lù rén]
This nickname translates to 'From once being inseparable to strangers today.' It refers to people who were once very close, perhaps friends or lovers, but now have drifted apart and no longer recognize each other. It expresses regret and nostalgia for lost relationships.