I think I am slow. Well actually, I don't. I just feel that way when faced with certain people and their particular problems.
So let me get this straight, mister man or sister gurl treats you like you are expendable and only remembers that you exist when they want something. They take you for granted, and make you a non priority in their life. You do everything for them, go out of your way even, and they don't even acknowledge it. You put 110% into the relationship (friendship or otherwise) and barely get .00674% back. The relationship causes you nothing but stress, heartache, and or annoyance, BUT YOU WILL NOT WALK AWAY!?!?!?!?
Sorry to say it, but you are a fool. Yeah, I said it. You are a fool.
If you willingly let a person walk all over you and take you for granted, whether that person be friend, family, or loved one, then I call you all kinds of a fool. All you are doing is giving that person permission to use you. When they know they can do what they want and you will just roll over and take it then you better believe they are going to go about their business without giving you any thought.
Letting yourself be used is not the business, and when it happens and you realise it, the first thing you should do is run for the hills. I never understand when people bemoan how this and that person causes so much trouble for them, but they will not walk away from the person. I don't understand this phenomena of "oh he/she did me dirty, but we are still friends". Really? REALLY? R.E.A.L.L.Y!!!
If someone is in your life who is no good for you, LEAVE THEM ALONE! Walk away and keep it moving.
That is all.