你非我人怎懂我心
[nĭ fēi wŏ rén zĕn dŏng wŏ xīn]
The meaning is 'you cannot understand my heart as you do not belong to me', indicating loneliness or misunderstood emotions. The username might signify feeling isolated or being in a situation where someone believes only people closely related or associated would comprehend their emotional landscape.