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Jon Gosselin<\/strong><\/a> is weighing in on his ex Kate Gosselin<\/strong><\/a>‘s love life.<\/p>\n While Kate has not publicly revealed her boyfriend of over a year<\/a>‘s identity, her former husband believes her mystery plus one is their family’s former bodyguard Steve Neild<\/strong>, who she denied having an affair with in 2009 amid cheating allegations.<\/p>\n “I told you all,” Jon wrote on Instagram Stories Sept. 24, sharing a screenshot of a Page Six <\/em><\/a>article alleging that Steve is Kate’s mystery boyfriend, citing a source. “No one believed me\u2014guess I was right!”<\/p>\n He added in an Instagram grid post<\/a>, “Guess who really ruined the marriage.”<\/p>\n Collin Gosselin<\/strong><\/a>\u2014one of Jon and Kate’s sextuplets who Kate has become estranged from in recent years<\/a>\u2014also alleged that Steve is the boyfriend in question and accused his mom of not being “truthful.”<\/p>\n “What really upsets me is that my mom had an affair with our bodyguard back in 2009, and for years would share hotel rooms with him while we went on family vacations, while I was in the connected room,” he wrote in a series of Instagram Stories Sept. 24. “Now everyone thinks her being with him is some cute novel romance.”<\/p>\n<\/div>\n