是我太纵容你是你太纵容我
[shì wŏ tài zòng róng nĭ shì nĭ tài zòng róng wŏ]
It means 'I pamper you too much, and you spoil me too much,' which describes a mutually indulgent relationship. Both parties may enjoy the comforts and affection from each other without setting clear boundaries.