Why we get so mad at loved ones more than anyone

I found this article on Facebook and it says what I've been unable to articulate for years now. If you are really mad at someone it's probably because you are projecting your thoughts about yourself on that person.http://www.heartsintrueharmony.com/relationship-bliss/the-surprising-reason-you-become-deeply-upset-with-your-partner.html?s=14773