原谅我面无表情却爱你好深
[yuán liàng wŏ miàn wú biăo qíng què ài nĭ hăo shēn]
Translates to 'Forgive my lack of expression but I love you so deeply'. This implies deep, internalized love hidden behind an unexpressive exterior, expressing complex and possibly painful feelings of unacknowledged affection.