Amanda Stanton and Josh Murray's relationship was far from paradise and they've split, according to sources, so what exactly went wrong?

The Bachelor in Paradise 3 couple got into a fight at KIIS FM's Jingle Ball concert earlier this month that put the nail in the coffin, Us Weekly reported.

According to an insider, Murray got upset and left Stanton at the concert because he caught her in a lie when their Bachelor in Paradise co-star, Ashley Iaconetti, disclosed a story about how the girls had been drinking together while enjoying a recent trip to Tahoe.

"Ashley said to Amanda in Josh's presence, 'We haven't been this drunk since Tahoe!' Then Josh got mad and said, 'You told me you didn't drink in Tahoe!'" the insider recalled to Us.

Murray reportedly checked in with Stanton constantly during that Tahoe trip.

"He needed to talk to her at all times to keep tabs on what she was doing," the insider added, noting that at Jingle Ball "Josh felt disrespected when he heard that Amanda was drunk in Tahoe, so he left her."

Sources close to Josh, however, say his argument with Stanton sparked over something "nasty" and disrespectful the mother of two had whispered in his ear at the concert.

The reality TV couple broke up the next day, according to TMZ.

Murray and Stanton reportedly endured a rocky relationship from the start because they had trouble navigating their relationship in the real world after Murray proposed during the September season 3 finale of Bachelor in Paradise.

"I know Josh had been unhappy with things for a while now but was holding on because he loves the kids," a source told Us, referring to Stanton's two daughters Kinsley, 4, and Charlie, 2, from a previous marriage. "But they're done now."

Murray -- who had been living with Stanton in her Orange County, CA, home since getting engaged -- allegedly moved back home to Atlanta, GA, shortly after the blowout fight.

Once news broke of the pair's split earlier this week, E! News reported that Murray and Stanton called it quits due to his "temper," which was a concern for Stanton's friends while filming Bachelor in Paradise, including the franchise's upcoming The Bachelor star Nick Viall.

The Paradise cast grew concerned about Murray's romantic pursuit of Stanton, who had been known as America's sweetheart, because his ex-fiancee Andi Dorfman had accused Murray in her first memoir of being verbally abusive and controlling, claims of which the former pro baseball player slammed as "ludicrous" and "fiction."