不是离开n1我就不能活
[bù shì lí kāi n1 wŏ jiù bù néng huó]
It roughly means 'Without n1 I cannot live'. In internet slang, 'n1' sometimes stands for 'no.1' meaning the one that is most beloved or significant to someone. So, this username implies an intense dependency on someone they admire or cherish most.