The 23-year-old model is said to have called it quits on their relationship, after the R&B singer and ex-girlfriend Rihanna were spotted making out at Griffin nightclub Monday night, reported Didital Spy.
"Karreuche finally had enough and dumped Chris for good. They had been on thin ice for a while, but after he was spotted getting with Nicole Scherzinger in a Los Angeles nightclub recently, and then when reports surfaced that he had hooked up with Rihanna... She finally dumped him.
"Karreuche was very patient with Chris, and never nagged him about what he had been doing whenever they were apart. She never went through his cell phone, but she suspected for a long time that he had been cheating on her for some time, she just never had the proof," a source said.
The couple have been dating since late last year, but Brown continued close friendship with Rihanna despite assaulting the 'Umbrella' hitmaker in 2009.