Frustration!

This has nothing to do with adoption...or adventures :)  I'm angry and frustrated and I need an outlet.  I have been lied to and misled by someone who I love and trust very much...it doesn't matter who.  This person caused a lot of problems for him or herself and refuses to take any responsibility and is trying to make their mistakes all my fault.  As an adult, I know that when I am wrong there is nothing wrong with admitting that I've made a mistake.  If I hurt someone else, I swallow my pride and apologize.  Why can't all adults do these small things that would actually make the world a much happier place?  I make my own decisions, and I deal with the consequences that come with them...without blaming other people.  I just don't know where to go from here, I really don't like feeling like this!