It seems the Chris Brown and Karrueche Tran romance cannot last.

The pair, who have not been seen together in public since Chris Brown's rehab release, have finally unfollowed each other on Twitter. While Karrueche Tran is nowhere in sight with Brown, it seems that he and Rihanna have rekindled old flames. Brown has reportedly reached out to Rihanna during his trying time between jail, rehab and court. One source revealed that "Chris started texting Rihanna on her birthday [Feb. 20], and the two have been sending each other a flurry of texts ever since."

"Rihanna didn't write back right away ... but later that night she started getting sentimental and texted back, 'thank you,' and asked how he was," a source said. "Since then, the two haven't stopped texting each other, and friends are freaked out that she's going to start dating him again."

Is it possible that Brown ended his relationship with "The Kill" fashion designer to rekindle his relationship with Rihanna?

To make the situation worse, Drake and Rihanna are rumored to be dating. The Canadian singeris allegedly "very much" in love with her and has been while she was last with Brown.

"He has a lot of heart for Rihanna and only wants what's best for her," a source said. "He stood by -- patiently, I might add -- while she was with the other guy. He didn't say anything. He didn't try to c*ck block. He didn't try to throw salt in his game. All he did was stay back and watch."

"Robyn made her choice back then, and while it didn't work out in the end, Drake still loves and respects her," a source said.

Drake calls Rihanna by her given name, Robyn. Still, Brown is not ready to give up on Rihanna.

"I'm stressed out," Brown said in a 2012 interview. "You share a history with somebody, then you tend to fall in love with somebody else, and it's kind of difficult. Is there a such thing as loving two people? I don't know if it's possible, but I feel like that... I'm being real. I don't want to hurt either. I'm not trying to be a player. I'm not trying be a dog, none of that. My moms raised me different... It's too much sometimes."

Brown was recently diagnosed with bipolar disorder, severe insomnia and post-traumatic stress disorder and was ordered by a California judge to stay in rehab for another two months. His next hearing is scheduled for April 23 after he appears in a Washington D.C. court on misdemeanor assault charges.