被最懂的人背叛最可笑
[bèi zuì dŏng de rén bèi pàn zuì kĕ xiào]
Translates as 'Being betrayed by the one who knows me best is absurd/laughable.' It refers to feelings of mockery, absurdity or helplessness when the person closest and understanding of them most chooses to harm or betray them.