Jenelle Evans' ex-fiance, Nathan Griffith, reportedly began using Ashley Madison after they called it quits last month.

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On Wednesday, Radar Online revealed Griffith's email address, “Nate_griff42@yahoo.com, which is linked to his Facebook account, was listed as a registered Ashley Madison member in the site's latest hack earlier this week.

“Once a cheater, always a cheater,” Evans told Radar of her ex's account. “I think he embarrasses himself and whoever associated with him, especially the girl he’s with now because supposedly she doesn’t believe in sex before marriage. But Nathan does.”

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A source close to the Teen Mom 2 couple confirmed Griffith's email was legit, and revealed he began using his account on Ashley Madison in May or June, while he and Evans were taking a break from their relationship.

“He was separated from Jenelle,” the source said. “But he was seeing [his new girlfriend] Jessica. He claimed he made it because he couldn’t remember his gmail password and was locked out of his old email. It’s definitely not shocking that Nathan has an Ashley Madison account. Jenelle is glad not to be the one having to deal with his antics anymore.”

So far, there's no word on whether or not Griffith's relationhip with Henry remains intact.

For more Jenelle Evans, tune into Teen Mom 2 season six on Thursday nights at 10 p.m. on MTV.

Tags: Nathan Griffith Teen Mom 2 MTV Reality TV Jenelle Evans jessica henry