没有了心的疯子
[méi yŏu le xīn de fēng zi]
'Madman Without Heart'. Such an expression can show the despair and numbness felt in love; after being hurt or letting go of past memories, one might lose the ability to feel pain. Or one wants to express that when lost loved ones in love or friendship, the emotional wound would make oneself seem unreasonable and irrational.