URGENT: what do you think about this?! isn't it cruel...!?

Well, I would ask first your reason for giving so much? Is it only for looks or for whatever you get back from it? If so then you should stop if she doesn't give equally. If you give out of love then you shouldn't worry what you get from her. I wish I had sisters to give to. I think I am a giving person and the first feeling I get when I give is praise, to God that I am able to help others.