Billy says he believes his wife, Jennifer, has been hacking their phones, computers, and online accounts for well over a year. Jennifer denies it. She claims she lied to Billy, falsely confessing to the hacking to save their marriage.

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WATCH: ‘I Lied To Him To Save Our Marriage’

“I honestly don't even know what's going on,” says Billy on Monday’s episode.

“I made a list of what you know for sure,” says Dr. Phil, adding, “You know that the PI (private investigator) said Jennifer's phone was not hacked, but that there are hacking apps that have been put on the phone.”

Watch the video above to find out what else is on Dr. Phil’s list. Plus, find out why Jennifer says she was visiting a “hook-up” site.

Part one of this two-part Dr. Phil airs Thursday. Check here to find out where you can watch

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Woman Claims She Made False Confession To Give Her Husband ‘Closure’