RIHANNA'S REVENGE
Rihanna is a Pisces and because it's the sign ruled by Neptune, she sees things the way she wants to see them. So it's entirely possible that she was in denial about the level of Chris Brown's temper. And if she perceived him as being a "wounded bird," she would stick around to help. Pisces people are very kind and will not put another person down based on something that happened during childhood. Your wounds are their wounds.
Due to Chris' natal Mars (violence) being opposed by Uranus (explosiveness), he is self-willed and erratic. When angered or threatened, he can strike out. But there is a level of shame afterward, because what provokes him comes on very suddenly to due Uranus. For him to say that this was unusual is a lie. Natally, he is violent -- which doesn't mean he can't grow up and stop a negative behavior. But it comes to him naturally. It's part of who he is. And if this relationship brings his career to a halt, it won't be anyone's fault but his own. I think it's hard for some of us to believe he is sorry, since it took him so long to speak out.
During the beating incident, Rihanna was in the middle of progressed Mars (energy) square (negative) Venus (people you love). From my own experience, I know that you can attract violent people during this cycle. In my case, it was the first and last time that happened, and I wish the same for Rihanna. She may never be tempted to place herself in this position again. It can be just the energy of this negative aspect.
If Rihanna had the same aspects as Jasmine Fiore (search Jasmine Fiore) , the result would be quite different. But instead, she had the protection of progressed Jupiter trine Sun. So she played with fire and won. And since this is also the fame aspect, it didn't hurt her career either.
I predict that Rihanna has learned her lesson and will go on to a very successful career. As far as Chris Brown is concerned, his progressed Venus conjunct Jupiter is over. He has abused the good luck he had. In about nine years, he'll get another chance, if he's still around.