你装聋作哑却不知我情深
[nĭ zhuāng lóng zuò yā què bù zhī wŏ qíng shēn]
'You pretend to be deaf-mute without knowing my depth of affection.' It refers to someone pretending not to notice one's sincere feelings, implying unreciprocated love or frustration when trying to communicate heartfelt sentiments.