Karrueche Tran over Chris Brown? Singer tweets 'She'll always be my heart,' Rihanna moves on with Drake?

Rumors of Karrueche Tran dumping Chris Brown over Rihanna's secret visit are still swirling, but the couple's break up isn't stopping the singer from proclaiming his love for "The Kill" fashion designer on Twitter.

Brown tweeted, "KAE will always have my heart. That ain't changing."

Tran made the final decision to let Brown go after finding out that he allowed Rihanna visit him while in rehab for 90-days.

According to the Confidenti@l sources say that the "Diamonds" singer visited Brown at the Malibu rehab center in late January and not in December. Rihanna jetted to the facility to check on her ex-boyfriend and only a few members on her team and a few staffers knew about the visit.

The source said Tran found out about the visit and Brown denied it at first, "With Chris in rehab, [he] and Karrueche spoke every day and she stood by his side. She took a vacation to Turks and Caicos and told friends the entire time that they were really good and happy together," the source revealed. "She trusts Chris, but when it comes to Rihanna, she has a zero-tolerance policy. Then she found out about the trip."

Rihanna, Drake dating strong, Cheating rumors don't worry Rih-Rih, Chris Brown loses ex-girlfriend to close 'friend'

The source continued, "She believed him, but he finally admitted that Rihanna had come to see him. She put her foot down and cut him off completely."

The model is so hurt by the betrayal that she is considering moving to New York City, "She just looked at an apartment in Tribeca to buy," says the source. "She isn't taking any of Chris' calls and he keeps calling her."

Recently, Tran announced that she was single after being photographed with NBA player, Brandon Jennings. She tweeted: "Not dating anyone stop w the bs."