Chris Brown may be begging ex-girlfriend Karrueche Tran for another shot at their on-again, off-again relationship, however, after Tran publicly dissed the "Loyal" singer on Instagram earlier this week, sources reveal the former couple got into another heated debate over their dating history.

Hollywood Life reports that Brown posted a sweet photo of himself and Tran in happier spirits, captioning the pic with, "I've learned so much from you. I wish u nothing but happiness and the best @karrueche all I was doing was trying to fight for the woman I love. Thanks I learned a lot."

While fans applauded Brown for the mature post, Tran responded with her own eyebrow-raising message.

"You know what's weak?? You forcing yourself into my broken window..blowing up my phone..trying to shower me w gifts..Man the f*** up and change the bs in your life like I've told you several times," the model fought back, reiterating her desire for Brown to stop contacting her.

Now, sources report that Brown went off on Tran after receiving her message, telling his ex that she knew what she was getting into when she started dating him.

"Chris is mad at himself for going off on Karrueche like that. He acted on impulse and wishes he didn't, but what's done is done, and he apologizes," a source close to the "X" singer admits.

"But the thing that bothers Chris the most is that Karrueche acts as if she didn't know what he was signing up for from the jump," the insider adds.

Tran has been vocal in the past about her relationship struggles with Brown and his former girlfriend, Rihanna. Tran and Brown began dating just two years after the R&B star famously assaulted Rihanna prior to the 2009 Grammy Awards, however, Brown and Rihanna shocked fans when they briefly reunited in 2013.

"Karrueche knew all about Chris' lifestyle when she first met him," the source continued, "He told her straight up that he likes that rock star life in every sense. She also knew that he was still madly in love with Rihanna when they first met, but did Karrueche care? No. Did she care about Rihanna's feelings? Nope. She wanted Chris just as much as he wanted her and she didn't care what woman's toes she stepped on," the source concluded.

Tran and Brown split in March after the model learned that the singer fathered a child, Royalty, with another woman while they were still together.

This article was originally published on Fashion & Style.