VIDEO : Chris Brown Says Shame Over Assaulting Rihanna Will Haunt Him Forever

In a new documentary about his former relationship with Rihanna, R&B singer Chris Brown is opening up.
In a preview of ' Chris Brown: Welcome to My Life,' Brown says things changed after confessing he had slept with another woman early on in their relationship.
According to ET Online, Brown claims their volatile relationship involved violence on both sides.
However, they reached a crisis when one argument culminated in Brown punching Rihanna in the face.
In 2009, Brown pleaded guilty to felony assault for attacking Rihanna. He now claims the incident will haunt him forever.