The Bible states, "there exists a friend who sticks closer than a brother."Unconditional love is taught in the Bible..Jesus said,"Behold, I am with you always,even until the end of this system of things."But most of the people I've had dealings with see it differently.If you've ever had this experience,I have people who , when you can do what they ask of you, they praise you all over the place, but then if you for a legitimate reason have to say "no",the same person who formerly praised you, now is cold as ice to you. Has that happened to you?But that's not the unconditional love spoken of in the Bible. That's CONDITIONAL love, Their high opinion of you is based on what you can do for them, and the one time you can't is unforgiveable to them.So the question is, is this a sin? I would say it's self-centeredness,because they're basing their thoughts of another on what they can get out of them.I would think to a certain extent it's a sin.Huh?{Also,you could've done things for them several times, then the ONE time you can't,that's it!!}