Sarah is accused of catfishing dozens of women over several years, and of using photos she stole from Alan, a man she didn’t know, as bait in fake dating profiles.

TELL DR. PHIL YOUR STORY: Are you involved in a story that has made the headlines?

Ken says he was “a bit naïve,” but he didn’t realize that the “elaborate stories” his on-again, off-again girlfriend, Sarah, told him may have belonged to other women she met online. He claims he had no idea the 24-year-old had stolen someone else’s identity, or that she was using it to engage in catfishing.

WATCH How Catfishing Destroys Lives

“I love Sarah, and I want to be with her, but there’s always been this lingering fear that she’s just a master con-artist,” says Ken in the video above.

WATCH ‘I Don’t Know What To Believe Anymore,’ Says Real-Life Boyfriend Of Admitted Catfish

Check here to find out where you can watch part one of a two-part Dr. Phil airing Thursday, then tune in for the conclusion on Friday when Sarah joins the conversation.

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Woman Claims Someone Has Been Using Her Husband’s Photos As Catfish Bait