“My wife, Yvette, has made my life a living hell,” says Steve. He says his wife of 28 years has accused him of cheating for the last 15 years. “I’ve never been unfaithful. I’ve never cheated on my wife.”
 
“My mom’s allegations of my dad’s cheating has turned my house upside down,” says Steve and Yvette’s daughter, Monique. She says her mom is “convinced” her father has had multiple girlfriends, won’t let him have his own cell phone, and believes he has hacked into the Wi-Fi router and the TV to communicate with other women. “When I think about what’s going on, I think it’s completely absurd. My parents are constantly fighting about my dad’s alleged cheating.”
 

Hear more of their story in the video above, including the results of a polygraph test Steve took -- and why he says he has stayed married to Yvette.
 
On Monday’s episode of Dr. Phil, "The Mystery of Our Messy Marriage: Who’s the Cheater?'," hear why Yvette says she’s certain Steve is cheating and claims she has the evidence to prove it. What does Dr. Phil determine after examining it. Check local listings to see where you can watch.

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