女人你不知道我有多痛
[nǚ rén nĭ bù zhī dào wŏ yŏu duō tòng]
It conveys intense inner pain felt toward a woman. 'You' here may not be a particular person but women in general or a specific lady who hurt this man deeply. There are lots of feelings hidden in those characters, perhaps a kind of complaint about misunderstanding or indifference from a lady.