Insane.

Why does it seem like girls can't rely on boys with their problems at times? And I'm talking about girls and boys in the relationship of friends. How come guys can come to girls and believe them and get advises but when a girl has problems, she can't go to a boy a say everything that's on her mind or he won't even care as much as she did for him? Girls can go to a girl they trust and it's so normal but then they can't do that to guys? I'm not saying that every guy is like this but why are there some that it's so hard to talk about things to?