Should I have exposed him privately instead

AITA for exposing my fiance affair at our own engagement party in front of everyone we love. I need to tell this whole story because I am still shaking. My name does not matter. What matters is that three years of my life just exploded in front of two hundred guests. Let me start from the beginning. I met Daniel through mutual friends. He was charming, successful, and every single person told me I was lucky. We got engaged six months ago and planned the biggest party our families had ever seen. My parents spent thousands on a venue overlooking the lake. Everything was perfect on paper. But two weeks before the party, I started noticing strange things. Daniel kept his phone face down. He took calls in the bathroom. He started working late constantly. I told myself I was being paranoid. Brides get anxious before big events, right. Wrong. The night before the party, his sister Melissa pulled me aside. She looked nervous and kept glancing over her shoulder. She told me she needed to show me something but begged me not to say where it came from. She handed me her tablet. On the screen was a message thread between Daniel and a woman named Courtney. The messages went back eight months. They were not innocent. They talked about meeting at hotels. They talked about how Daniel would end things with me after the wedding because leaving before would look bad for his business reputation. My stomach dropped to the floor. I read every single message twice because I could not believe what I was seeing. The man I was about to marry was planning our entire future as a cover story for his affair. I did not sleep that night. I sat on the bathroom floor replaying every late night, every secretive phone call, every excuse that now made horrible sense. The next day was the party. Family flew in from three different states. My grandmother wore her best dress for the first time since my grandfather passed. I could not cancel without destroying everyone plans, but I also could not stand there and pretend everything was fine. So I made a decision that some people say was cruel and others say was justice. During the toasts, when Daniel stood up holding his glass of champagne, I asked to speak first. I thanked everyone for coming. Then I looked directly at Daniel and asked him one simple question in front of the entire room. I asked him to tell everyone honestly who Courtney was. The room went silent. His face turned white instantly. He stammered something about a coworker, but I already had the messages pulled up on my phone. I read three of them out loud, including the one where he said marrying me was good timing for his career. Gasps filled the room. His mother dropped her fork. My own mother grabbed my hand so hard it hurt. Daniel tried to grab my phone, knocking over a centerpiece in the process. Security had to step in because his own father started yelling at him in front of everyone. The party that was supposed to celebrate our future instead became the moment his double life collapsed publicly. Melissa later told me she had known for months but was terrified to say anything because Daniel threatened to cut her off financially if she interfered. She finally could not watch me walk into a marriage built on lies. Courtney, it turns out, was engaged herself, completely unaware that Daniel was also planning a wedding with me. When she found out through mutual friends after the party video leaked online, she ended things with him immediately. The video of my toast somehow got posted by a guest and gained millions of views within days. People either called me a hero for protecting myself or said I should have handled it privately instead of humiliating him publicly. My own parents are split on it too. My mother says I did what needed to be done. My father thinks I should have confronted him quietly beforehand. Daniel has since tried contacting me multiple times, claiming I ruined his reputation unfairly. Meanwhile I am left wondering if exposing him that way, in front of everyone, was justice or just as petty as what he did to me. So tell me honestly, was I wrong for choosing truth over tradition on what was supposed to be the happiest night of my life.