“Teen Mom” star Leah Messer has remained mum about why she and fiancé Jaylan Mobley broke up.

But now, the messy scandal behind their breakup has been revealed.

The reality TV star and her fiancé of two months called it quits last month.

On November 2nd, The Ashley’s Reality Roundup reported that Messer’s ex-fiancé “did everything he could” to prevent Messer from telling the full story.

A source told the outlet that the 26-year-old was unfaithful to the MTV star.

Messer reportedly “saw material suggesting he was unfaithful.”

Ashley’s source revealed there’s “definitely more” to the breakup that has remained under wraps and there’s a massive price tag attached to it.

He ensured Messer wouldn’t spill the entire pot of tea by forcing her to sign a non-disclosure agreement (NDA).

"Jaylan does not want the full story getting out there," the source stressed. "He did everything he could to keep Leah from going public with the story."