It's unknown who the source is, but according to someone close to Chris Brown and Rihanna is comparing their relationship to that of Bobby Brown and Whitney Houston.  

"Their relationship is like the early Whitney and Bobby days.  She loves that old Whitney jam ['Something in Common'] and knows that she and Chris have so much in common that just bonds them. They get each other just like Bobby and Whitney. You could see it's like real love with she and Chris—like ain't no bullsh-tting. The sh-t is magical and it's real."

Bobby and Whitney, as everyone knows, was a very rocky relationship that was filled with physical abuse allegations and substance abuse.  Hopefully Chris and Rihanna won't follow that path all the way through.