心已有他没有你心已入她不入你
[xīn yĭ yŏu tā méi yŏu nĭ xīn yĭ rù tā bù rù nĭ]
My Heart has been owned by him/her, but never belonged to you. In short, it means there isn’t place for the one speaking except in this stranger’s hearts. It expresses a kind of melancholic, bittersweet sentiment where unreciprocated feelings exist.