闺蜜闺蜜以诚相待换来背叛
[guī mì guī mì yĭ chéng xiāng dài huàn lái bèi pàn]
It expresses the sadness or betrayal experienced between best girlfriends who treat each other with all sincerity yet end up suffering backstabbing, showcasing themes related to friendship, expectation, and eventual disappointment.