Aita For Filming My Own Wedding Reception

AITA for filming my own wedding reception and exposing my sister on the dance floor. I need to explain everything because my family thinks I am the villain now. My name is Rachel and I am thirty one years old. Three months ago I married Derek after four years together. My younger sister Melanie was my maid of honor. She helped plan everything from the flowers to the seating chart. I trusted her with my life. Two weeks before the wedding I started noticing something odd. Derek kept guarding his phone like it held nuclear codes. He would leave the room to take calls that lasted way too long. When I asked who he was talking to he always said work. I let it go because wedding stress was already crushing me. On the actual wedding day something felt wrong the entire time. Melanie kept touching Derek shoulder during photos. She laughed at his jokes a little too hard. I told myself I was imagining things because brides get paranoid. During the reception I hired a videographer to capture every moment. I wanted memories for our future children to watch someday. Around midnight most guests had left except close family. Derek and Melanie disappeared toward the parking lot together. I noticed because my mother pointed it out to me. She said maybe they were grabbing something from her car. Twenty minutes passed and neither of them returned to the tent. I walked outside pretending to search for fresh air. What I found behind the catering truck destroyed me instantly. Derek had Melanie pressed against the truck kissing her deeply. My wedding dress train dragged through gravel as I froze there. Neither of them noticed me standing just feet away in shock. I pulled out my phone and started recording everything happening. My hands shook so badly the video came out unsteady. I walked back inside and grabbed the videographer immediately. I told him to keep filming no matter what happened next. Then I walked onto the dance floor and grabbed the microphone. I announced that I had a very special surprise for everyone. I played the video on the projector screen behind the band. Gasps filled the room as my mother nearly fainted from shock. My father stood up so fast his chair crashed backward loudly. Derek came running inside trying to grab the projector cord. Melanie stood frozen by the entrance with mascara running down her face. I looked at both of them and asked one simple question. How long has this been happening between the two of you. Derek stammered something about it only being one drunken mistake. Melanie finally admitted through sobs that it started eight months earlier. Eight months meant this began while they were helping plan my wedding. Every dress fitting every cake tasting was a lie wrapped in smiles. My mother screamed at Melanie while my father dragged Derek outside. Guests filmed everything on their phones within seconds of the reveal. The video spread across social media faster than I could process anything. People started calling it the wedding reception heard around the internet. Now my extended family says I ruined the night for everyone else. They claim I should have confronted them privately instead of publicly. My aunt said I embarrassed the family name by causing a scene. My grandmother will not speak to me because Melanie is her favorite. Meanwhile Derek is telling people I trapped him into looking guilty. He says the kiss was consensual but claims I overreacted with the video. Melanie posted an apology online then deleted it within one hour. She now says I invaded her privacy by recording a personal moment. I filed for annulment the next morning before the shock even settled. My lawyer says the marriage was never consummated so it should be simple. Derek keeps texting asking me to reconsider for the sake of appearances. Melanie sent one message saying she never meant to fall for him. I have not responded to either of them since that night. Some friends say I handled it perfectly by exposing them immediately. Others say public humiliation was cruel even if they deserved consequences. I keep replaying that moment behind the catering truck over and over. I keep wondering if signs were there for months before I noticed. Was I wrong for turning my own wedding into a public reckoning.