Chris Brown played the Rihanna card one too many times with Karrueche Tran ... we've learned Karrueche has not only broken up with him ... for safe measure she changed her number.
Our sources say Karrueche exploded when Chris recently "liked" 2 fan photos on Instagram of Rihanna and him together.
But Rihanna was only a small part of Karrueche's problems with Chris. We're told she was unhappy for a long time ... as sources put it, because "Chris acts immature, like a child." She thinks he's ruining his life by spending more time partying than making music.
( Parties in St. Tropez with Kae's FriendCollapse )