我不是你的那个谁
[wŏ bù shì nĭ de nèi gè shéi]
Meaning 'I'm not the person for you'. It could mean they believe themselves different and irreplaceable; nobody can be someone special for another person inimitably. Perhaps the individual prefers not to play an important part or bear a particular duty within a relationship because every human being deserves equal respect for their personality, uniqueness, and freedom.