Jon Gosselin is weighing in on his ex Kate Gosselin 's love life.

While Kate has not publicly revealed her boyfriend of over a year 's identity, her former husband believes her mystery plus one is their family's former bodyguard Steve Neild , who she denied having an affair with in 2009 amid cheating allegations.

"I told you all," Jon wrote on Instagram Stories Sept. 24, sharing a screenshot of a Page Six article alleging that Steve is Kate's mystery boyfriend, citing a source. "No one believed me—guess I was right!"

He added in an Instagram grid post , "Guess who really ruined the marriage."

Collin Gosselin —one of Jon and Kate's sextuplets who Kate has become estranged from in recent years —also alleged that Steve is the boyfriend in question and accused his mom o

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