一个人不够两个人左左右右
[yī gè rén bù gòu liăng gè rén zuŏ zuŏ yòu yòu]
'One person isn't enough; two persons feel left and right,' which may imply the imperfection or lack in a singular state compared with pairing up, hinting at desires unfulfilled when alone but confusion arising with companion(s).