DEAR ABBY: I am in my late 20s. My mom and dad will soon have been married for 30 years. I accidentally found evidence recently that Mom is having an extramarital affair. When I confronted her, she said I should go to therapy to help deal with my overreaction to her “doing something I don’t like.” She totally ignored the fact that it’s not just a minor thing that I’m upset about, but something wrong, immoral, hurtful and disrespectful to my dad, my brother and me.