你都不是非我不可而我却是非你不爱
[nĭ dōu bù shì fēi wŏ bù kĕ ér wŏ què shì fēi nĭ bù ài]
You Are Never Indispensable To Me, But I Am Incapable Of Loving Any Other conveys unreciprocated love. The owner feels their love interest can exist independently (non-dependent), whereas they cannot imagine being attached otherwise—reflecting a one-sided dependency in emotions/romance.