Ethan Swope/Getty Images Theranos founder Elizabeth Holmes took the stand again in her federal fraud trial this week. Holmes testified that her ex and former COO, Ramesh "Sunny" Balwani, abused her. She described trying to kill an exposé and said she wished she'd listened to a whistleblower. Holmes says Balwani abused herHolmes testified Monday that Ramesh "Sunny" Balwani, her ex-boyfriend and Theranos' former president and COO, physically and emotionally abused her.