Chris Brown is opening up about attacking Rihanna last February and admits that he realizes just how much his behavior has affected the pop star. "I can see what damage it does, mentally, more than physical," he says during an interview with Robin Roberts that will air on 20/20 tonight. "I was wrong for what I did. And I would definitely say that it's not something that I look past or look over. I'm human, really, I'm like really hurting inside. And it really is devastating to me," Chris adds.