Please, I need to help my brother?

Oh wow. It's obvious that this girl is controlling him like a porcelain doll, and he needs to break up with her immediately. He needs to open up his eyes and realize that she is very bad for him. That... That is the best advice I can give to you... If I told you what I would do, you'd probably get hurt, and I don't want that to happen. Sorry, and best of luck.