AITA for telling my sister the truth at her own wedding

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AITA for telling my sister the truth at her own wedding? I always knew my sister's fiance was cheating. I had proof, texts, photos, everything. But right before the wedding, I promised myself I would stay quiet. Not my business, right? Then at the reception, he stood up and gave a speech about loyalty, about how he would never let her down. I just sat there watching my sister's face light up. I could not do it. I stood up, walked to the microphone, and said I had something to add. I showed her the messages, right there, in front of everyone. She left the venue in tears. My parents have not spoken to me since. They say I ruined the happiest day of her life. But I keep thinking, wasn't it worse to let her marry a liar? So Reddit, am I the a**hole for telling my sister the truth at her own wedding?
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