AITAH for Ruining My Sister's Wedding With a Secret I Swore to Keep?" My (28F) sister Lisa (31F) has always been the golden child of the family. She's beautiful, smart, successful, and my parents' favorite. Growing up, I was the awkward, shy one always living in her shadow. But despite that, I adored her. We were close, and I thought she cared for me just as much as I did for her. Three years ago, my then fiancé, Mark (32M), broke off our engagement out of nowhere. He gave me some vague...