Why does the right decision still hurt?

It is most often a decision to be made between what is right, and what is easy. What makes something easy is often the absence of hurt. For example, leaving someone who is not nice to then be alone. It is easier to stay with a person who is nice over half the time than leave and be alone.
Or the difference between blaming others or taking a look at your own mistakes and blaming yourself. One is easy, one hurts but its worth it.