I was married to my ex (no kids) for just under a year, we divorced because he cheated on me. We had a friend at the time that I felt I was close to. After my divorce, my friend and I drifted apart (she was not involved in the divorce) and we hadn't spoken for several years.
Well, I've remained close to my former in-laws, and there's a family event coming up. It turns out that my ex is now dating my former friend. How should I react if we run into each other? Even though it's been nearly ten years, I still have a lot of hurt feelings about what my ex did to me, and I'm not sure how to feel about my "friend" dating him now.