闺蜜要比情人长久兄弟要比恋人长久
[guī mì yào bĭ qíng rén zhăng jiŭ xiōng dì yào bĭ liàn rén zhăng jiŭ]
A notion promoting stronger ties between close friends (female friends) and brothers than romantic relationships—'Friends and brothers are more enduring than lovers.'