EXCLUSIVE: Mariah Carey and Bryan Tanaka Split -- When It All Went Wrong

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Mariah Carey and Bryan Tanaka's breakup has been a long time coming, a source close to the former couple tells ET.

The 47-year-old singer has split from Tanaka, her 33-year-old backup dancer, the source confirmed to ET on Monday. While the relationship had been "tapering off" for a while, according to another source close to Tanaka, the relationship started to really fall apart on St. Patrick's Day, when the pair dined at Los Angeles hot spot Catch. The two memorably went all out for the occasion, Carey sporting a tight, green leather dress and posing with two men dressed as leprechauns.

TwisT / SPW / Splash News

NEWS: EXCLUSIVE: Nick Cannon Weighs in on Mariah Carey and Bryan Tanaka's Split 

The source says that while at dinner, Carey was overheard telling the Catch wait staff that she was still very close to her ex-husband, Nick Cannon.

And things apparently went downhill from there.

"Tanaka was extremely jealous, upset and he stormed off [from] the table," the source claims. "Tanaka has long been jealous with Mariah’s close relationship with Nick Cannon."

Tanaka returned to the table, an eyewitness at Catch tells ET, but not without some drama.

"Mariah saw him come back and openly flirt with a female waitress, which really upset Mariah. She was furious," the eyewitness says. "He was ordering lots of food, drinks and putting it on Mariah's tab."

Sources claim to ET that Tanaka was dating Carey to help launch a music career. "Tanaka says that he never pays for anything and was freeloading on Mariah and using her for her fame and money to increase his profile," a source close to the former couple claims. "He's always desired to have a music career and was hoping that being with Mariah would help launch his music career. He was hoping to collaborate with her."

And although Tanaka joined Carey and her friends in Cabo San Lucas, Mexico, in March to celebrate her 47th birthday, the relationship had "already cooled off," another source says, noting that Carey didn't post any social media pics with him in them.

"He was posting pictures with her trying to make it look like everything was fine, but it wasn't," the source says.

According to TMZ, who was first to report the news, Tanaka also felt "disrespected" when Carey and Cannon attended the Nickelodeon Kids' Choice Awards together with their children last month, and demanded that she come home.

ET sat down with Cannon on Monday, who weighed in on the split news.

"Most men are jealous of me. I'm joking," he cracked. "But I know nothing about it. For me, at the end of the day, she's an amazing mother and we focus on our kids. That's never going to change no matter who's in my life or who's in her life. We have kids together, so we'll always be family."

Carey and Tanaka first sparked romance rumors in October, as her relationship with her ex-fiance, billionaire James Packer, was coming to an end.

WATCH: Mariah Carey Celebrates Birthday in Cabo With Bryan Tanaka By Her Side

Of course, the newly single Carey has plenty going on in her professional life to keep her busy. On Monday, she announced that she's created her own record label, Butterfly MC Records, which is a joint partnership with Sony Music's Epic Records.

"I am putting my heart and soul into making more new music," Carey said in a statement.  "I am so thrilled for this next chapter and to continue working with, and for, everyone that I love."

Check out Carey and Tanaka in happier times in the video below: