我只能伴你左你的右已有人
[wŏ zhĭ néng bàn nĭ zuŏ nĭ de yòu yĭ yŏu rén]
This suggests feelings of inadequacy in romantic relationships or friendship loyalty issues. It describes the situation wherein someone can accompany you only from the left, because the right side, traditionally reserved for lovers, is already taken by another person.