True , people will usually use things against you to make them look better. You could be a nice person but others are only out to save themselves. there are many edxamples of this. People usually do it to turn people against you or to make themselves look better. Most basic form of manipulation. Eliminate people that use things against you or things from a year or a couple of years ago and making it relevant. Take sneaky/shady people out of your life also.