Chris Brown broke up with Karreuche Tran because of Rihanna.

The 23-year-old singer has revealed he called it a day with the model because he couldn't give up his close ''friendship'' with former flame Rihanna, who he was spotted kissing at New York nightclub Griffin on Monday night (01.10.12).

Chris told US Weekly: ''I have decided to be single to focus on my career. I love Karrueche very much but I don't want to see her hurt over my friendship with Rihanna.

''I'd rather be single allowing us to both be happy in our lives.''

The 'Don't Wake Me Up' hitmaker has dated Karreuche since late 2011, but constant reports of his secret rendez-vous with Rihanna were a source of contention in their relationship.

Karreuche was left fuming and ''humiliated'' after the recent nightclub incident with her love rival, and took to twitter to post a series of cryptic messages about Chris, ending with: ''Bye baby''.

Once a free agent, however, Chris wasted no time in meeting up with Rihanna and they were pictured on an intimate date at Jay-Z's concert at New York's Barclays Centre last night.

The 'Diamonds' singer recently called Chris ''the love of my life'' in an emotional interview with Oprah Winfrey - despite him violently assaulting her in 2009 - and the pair shared a public peck on the lips at the MTV Video Music Awards last month.

A friend of Chris' has now come forward and said: ''Chris really wants to be free to pursue Rihanna now that she wants him back. They will be together, trust me.

''I always told you he'd go back to Rihanna in a heartbeat when she was ready.''