你不能让我哭我不会让你哭
[nĭ bù néng ràng wŏ kū wŏ bù huì ràng nĭ kū]
'You shall not make me cry, I will not let you cry either.' It implies mutual emotional protection, expressing the determination to stand by each other and not allow each other to be sad or harmed. It’s an intense and affectionate promise made usually between close people.