PICTURE : Chris Brown and Karrueche Tran back together?

This is probably the reason him and Rihanna can't seem to make it work. He can't seem to stay away from his ex, Karrueche Tran. The ex lovers were spotted together backstage on Thursday May 9 after Chris performed at a show in San Fransico.

The following day he sub-tweeted Rihanna. I quote

(She's not mine if she's everybody else's)

Well I believe Rihanna needs to let him go for good..