鱼没有水会死我没有你会亡
[yú méi yŏu shuĭ huì sĭ wŏ méi yŏu nĭ huì wáng]
'Yu meiyou shui hui si, wo meiyou ni hui wang' literally means 'Fish will die without water, I will cease to exist without you'. It vividly describes dependency on another person to the point where one considers they couldn’t live without the presence of the loved one.