What are good brothers or perhaps best friend?

Do you have a good brother or perhaps best friend? What are good brother or best friend imply to you? Have you ever think of you may treat them as brother or sister or perhaps best friend however in return they just treat you as a normal stranger? Just because they are using you for you have what they need and eventually they dump you aside when they done with you. How you feel if that happen to you? Angry?, Upset? Feeling lost?