Why keep them around?

A certain someone keeps asking me why I still talk to certain people. I keep telling them the same thing over and over again but they just do not understand. They are friends to me but I know there faults and I know what I can and can not count on them to do. Sometimes they are easy to talk to while other days it is all about them. Sometimes it is just nice to chat with them to remind me why I stopped hanging around with them or doing things with them. LOL...