What you do when a girl you know is suffering?

She acts tough, she never really lets me hug her or anything, well, she's like that with most people, she always says "please don't or ill break into tears", something like that, so most of the times i help her with anything i can, talk to her, tell her everything is going to be fine and try to keep her happy.

I guess that SOMETIME ill have to tell her, otherwise ill be stuck feeling like this forever ._.

Thanks for the advice guys