ABCNews -- In an exclusive interview, music superstar Rihanna sits down with Diane Sawyer revealing publicly for the first time what happened last February with singer and ex-boyfriend Chris Brown. "He was definitely my first big love," she told Sawyer. "The more in love we became, the more dangerous we became for each other." The incident resulted in the couple's seemingly fairytale relationship being shattered and Brown being sentenced to community labor, five years of probation and one year of domestic-violence counseling. "...This happened to me...it can happen to anyone," Rihanna said. The interview is scheduled to air on "Good Morning America" on Thursday, Nov. 5 and Friday, Nov. 6 at 7 a.m. ET, and on "20/20" on Friday, Nov. 6 at 10 p.m. ET....