说好一辈子可你转头就走
[shuō hăo yī bèi zi kĕ nĭ zhuăn tóu jiù zŏu]
This can be understood as 'You promised forever, yet you turned away.' This nickname speaks about a betrayal of trust or promise, where despite vows or promises, someone unexpectedly left, leaving feelings of regret and disappointment behind.