"How could they do this to me?"
While I may not know you personally, I'm willing to bet that you've asked this question more than once in your lifetime. Worse yet, some of these experiences occurred with people you knew, loved, and trusted. This makes these situations all the more painful because there is an expectation that they wouldn't (or shouldn't) knowingly caused us harm. And in the midst of all the pain, we are left to wonder why it happened.