你不懂我爱你得有多深
[nĭ bù dŏng wŏ ài nĭ dé yŏu duō shēn]
'You Don't Know How Deeply I Love You' reveals the depth of love or affection that goes unappreciated or unrecognized. Perhaps it hints at the feeling that only this person can really understand how much love or passion the user has in them.