你是我的但我不是你的
[nĭ shì wŏ de dàn wŏ bù shì nĭ de]
It means 'You belong to me, but I don't belong to you.' It directly conveys a complex situation regarding ownership or loyalty within a relationship where there is an imbalance in terms of affection or commitment, which can lead to feelings of dissatisfaction and longing.