Saints and sinners.

Taylor Frankie Paul admitted to cheating on Doug Mason — who received her final rose and proposed to her on “The Bachelorette” — with her ex-boyfriend Dakota Mortensen.

“This is so bad,” she said in a confessional during Thursday’s premiere of the “Secret Lives of Mormon Wives” Season 5.

“So yes. I came home from ‘The Bachelorette.’ Night of, [Dakota and I] were texting, he was like, ‘When are you coming home?’”

Paul went on to explain that she and Mortensen had been communicating to figure out the co-parenting situation of their 2-year-old son, Ever.

“And then I don’t know how it got to the point of like, yeah, he came over…

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