我不是你的第三者
[wŏ bù shì nĭ de dì sān zhĕ]
'我不是你的第三者' means 'I am Not Your Third Wheel,' suggesting a relationship situation that's often awkward, such as being an extra party in what should be two. However, there is a deeper sentiment expressed here, possibly denoting respect for a relationship that one should not intrude on, or indicating a desire to move on from a complicated relationship dynamic.