爱你却怎么也说不出口
[ài nĭ què zĕn me yĕ shuō bù chū kŏu]
Expressing deep affection for someone while being unable to verbally convey it ('love you so much yet find it difficult/impossible to tell you'). This suggests having bottled-up emotions or feeling restrained by fear, insecurity, shyness, or respect.