Why do people act like you owe them something?

That sh*t is so irritating. Dang! Like I'm not obliged to do anything for you, if I can I'll be more than willing to, but if not I just can't. Or like say you went out Saturday night without inviting one of your friends and its an honest mistake, then she thinks you are ditching her and carves out a plan to "get you back," by lying against or something crazy like that. Or Maybe I'm just surrounded by psychos. lol. Do you have any similar experiences?
Why do people act like you owe them something?
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