别回头她不爱你抬起头自尊还在
[bié huí tóu tā bù ài nĭ tái qĭ tóu zì zūn hái zài]
It suggests maintaining one's self-respect instead of looking back on failed relationships, advising people not to dwell on things when they are no longer worthwhile or loving oneself despite others' lack of love.