Kate Gosselin has been secretly dating her bodyguard, Steve Neild, for close to 20 years, and according to her ex-husband, Jon , the romance killed their marriage , RadarOnline.com can reveal.

The mom-of-8 recently revealed she's been in a relationship with a mystery man for "a little over a year," after knowing him "for a really long time," but Jon seems to be singing a different tune. Article continues below advertisement

Jon Gosselin's Reaction To Ex-Wife's New Relationship Tap Here To Add Radar Online as A Trusted Source

"I definitely think it's her bodyguard Steve, 100 percent," Jon told The U.S. Sun, of who he thinks his ex-wife is now shacking up with. "He's been a consistent person in her life.

"I'm not even upset that she's with someone... I'm more concerned a

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