People who are mean to you but nice to you when you are mean

This is one of the things that bother me the most about human nature-- the desire for what we can't have and the tendency to treat the things we do have like shit.

Have you ever noticed how the nicer you are to some people, the meaner they are to you? Then when you get fed up and start being mean, they try to be nice...

It bothers me so much because then you feel guilty for them being nice and try to be nice yourself then they become mean to you again.