I have had a good friend for five years---primarily because our kids are the same ages and genders, go to the same school, live close to us, etc. Last April, I offered her some confidential information about our school intended to help her, but she told the principal, and it jeopardized my job at the school, not to mention stressing me out for several weeks. I feel very hurt, betrayed and angry. She acts as if nothing happened. We haven't talked in person since then, but obviously, I am going to run into her. What to do now?