It's not that you care, it's that your roommate is rude. Or stingy. You like sharing, so don't give it to her. You don't think it's good not to share. If you give it to her, you don't feel treated politely. If it happens again and again, it depends on your mood. You are willing to pay, and there should be no burden in your heart if you don't pay. Kind and lovely children's paper