Karrueche Tran OVER Chris Brown, Dating New Mystery Boyfriend Amid Kendall & Kylie Jenner Lap PHOTO & 'IDFWU' Song Diss? Rihanna's Ex Still 'Lonely'

The drama between Chris Brown and his on-and-off again sweetheart Karrueche Tran never seems to end! The popular couple officially "broke-up" after Breezy went on an epic Instagram rant, deeming the aspiring model a hip-hop "groupie." But apparently the "Loyal" crooner had a huge change of heart, and now he wants Tran back for good.

Well, doesn't look like that's happening anytime soon!

Just over the weekend, Brown and Tran were spotted at the same two Hollywood locations (although not together). But the 26-year-old beauty was quick to shutdown any romantic reunion rumors via Instagram...

Ouch! Instead, Tran cuddled-up to this OTHER handsome guy:

karrueche: "fork it."

Still no legit details on who this "mystery" man is - rumors suggest he's Tran's gay best friend (or even her cousin). But the snapshot appears pretty flirtatious. Still a pretty big dig aimed directly at Rihanna's ex beau! Several fans sure think so:

trendy.redd: "moved on fast or naw."

godoriggg: "where my boi Breezy@??? ahhh dats sum... fukd... u still beautiful though!"

alea_loca_813: "You a th*t... invisible a$$, you better stay with Chris Brown or find a new dude to keep your a$$ on the map #fr."

Anyway...

According to the Daily Mail, Tran really felt disrespected after Brown recently shared this photo partying alongside Khloe Kardashian and younger half-sisters, Kendall and Kylie Jenner:

That was ultimately the last straw, although Breezy continues trying to "win" the bikini babe's heart back. Primarily because he doesn't want to be lonely this holiday season...

But did the X superstar STILL continue "dissing" his ex-lover when she wouldn't forgive him? On Saturday (December 13), Brown began dancing to Big Sean's epic diss track "IDFWU" while performing onstage at the Dope Music Festival in Washington. As the infamous gossip webloid HollywoodLife.com points-out, Breezy flaunted his middle-finger during Sean's "I don't f*ck with you" declaration:

A video posted by BREEZY (@chrisbrownofficial) on Dec 12, 2014 at 3:53am PST

Will the two ever reconcile for good?