为你哭过的人一定很爱你
[wéi nĭ kū guò de rén yī dìng hĕn ài nĭ]
It can be interpreted as 'the person who sheds tears for you surely cherishes and adores you a lot.' This idiom highlights that true love usually accompanies genuine emotions expressed via crying because they care too much to endure your suffering alone without expressing themselves outwardly.