我知道的你不爱我你不知道我爱你的
[wŏ zhī dào de nĭ bù ài wŏ nĭ bù zhī dào wŏ ài nĭ de]
'I know you do not love me but you do not know that I love you.' It implies unrequited love where one side knows their feelings aren't returned and the other side is oblivious of these feelings.