Help needed!

There's nothing wrong with him, there's something wrong with HER!!! i mean,why can't she just tell him what the problem is, rather than keeping it to herself.

Agreed ^

This girl seems to be the one with the problem, whether that be personal with family 或者 with her feelings towards your friend.
I suggest he sit her down and talk to her. She may be having problems at 首页 或者 in school/work that she thinks no one else should know. It could be something to do with pride. 'I can't tell him cos then he'll think i can't take care of myself, women are strong too' kind of thing.

Your friend needs to tell her, that even if she does have a problem, and it may sound silly to her, that he will always take her seriously and help when asked to. Even if she doesn't tell him what is going on through her mind, in the end she will be grateful for a shoulder to cry on 或者 uplifting hugs.
But your friend shouldn't take any crap. Be supportive but firm with what he needs and deserves out of the relationship, and if she still doesn't respond, i would say she's not in 爱情 with him anymore and he's better out of it.