First: Gorgeous, smart, funny guy and gorgeous, smart, funny gal had been together 15 years. He’d proposed three times during their relationship. She always said no. One drunken night on vacation she proposed to him; he said yes. Beautiful formal beach wedding; less than a year later they divorced. It was bitter and ugly, no kids, thankfully. But she accused him of hiring people to spy on her, and also accused him of taking all her money for a bogus business scam on his part, which didn’t exist. Turned out she had a massive drinking problem he’d never paid attention to.
Second: Attended a beautiful wedding of a good guy friend from work. Years later, when they separated, he told me he knew the moment he saw her at the ceremony she was NOT the one (she arrived by horse-drawn carriage and it was amazing). Another really ugly divorce, made worse because they had two kids.