待我日久生情少女你心不在
[dài wŏ rì jiŭ shēng qíng shăo nǚ nĭ xīn bù zài]
'As time goes by and affection grows, your heart isn't there any longer.' This expresses unfulfilled feelings over time or unreciprocated growing affections. A girl's sentiments deepen yet her love interest does not match her increasing emotion.