Every week millions of viewers around the world tune in to the TV show Cheaters and witness what appear to be heart-wrenching stories of infidelity as they happen.

In every episode a suspicious spouse, boyfriend or girlfriend, turns to the show to learn whether their loved one is having an illicit affair.

The show's team of private detectives follows the suspected cheaters, and when they've got the goods, Cheaters host Joey Greco moves in for a dramatic and sometimes violent confrontation.

The show has had a successful 10-year run in syndication. Every episode begins with this seemingly sincere message: "You are about to view actual true stories, filmed live."

Bobby Goldstein, the show's owner and executive producer, is adamant that every episode is real.

"Are these true cases?" asks INSIDE EDITION's Chief Investigative Correspondent Matt Meagher.
"Yes"
"You're sure?"
"I'm positive," says Goldstein.

"No, it's not real at all," says Cari Wyatt, who tells INSIDE EDITION she was paid $500 to appear in an episode of Cheaters. She says she was asked to pretend that she was having a torrid affair with one guy while she was engaged to another.

But Wyatt says she never met either man until the day they started shooting and that the whole thing was fake.

"That whole thing was fabricated?" asks INSIDE EDITION's Matt Meagher.

"Correct," laughs Wyatt. "I've never been engaged."

The couples caught on Cheaters aren't very discreet, apparently meeting each other again and again in public places, making it an easy job for the show's detectives. In episode after episode, the couples they follow around always seem to have their romantic rendezvous right in front of a big window.

Wyatt says, "They asked us to sit next to the windows, ham it up a little bit, be flirty and touchy, to kiss a couple of times, but we never did, we just faked it."

Carl Burmeister says he was paid to play Wyatt's lover and that the entire episode was shot at the home of one of the show's producers. The program also claimed that the cheaters were under surveillance for three weeks, but Burmeister says that in reality it was all shot in just two days.

Wyatt, although under the legal drinking age at the time of the taping, told INSIDE EDITION she was given alcohol in an attempt to loosen her up for the romantic scenes.

But the best-known episode of Cheaters, the episode that put the show on the TV map, is the episode where host Joey Greco gets stabbed by an irate man caught cheating.

"So none of it was true?
"No," says Cassandra Terrazas, a Dallas hotel receptionist who says she was paid $350 for a few days work playing a woman who is caught having an affair with the man.

She was told the confrontation would take place on a lake located near Dallas. "It was all set up," she says. "They just rented a boat for us and we were supposed to be out like we were fishing and I was supposed to be sunbathing, and then they were going to come up on another boat and catch us."

As typically happens on the program, host Joey Greco lectured the people caught cheating on the immorality of infidelity. But on this occasion, a fight broke out and it appeared that Greco was stabbed in the stomach by Cassandra's supposed "boyfriend."

The young man was immediately restrained, and Greco, blood gushing from his wound, was rushed back to shore where paramedics fought to save his life.

A police car sped away, and the viewer is led to believe the knife-wielding cheater has been arrested and taken to the Rowlett Police Station.

But according to the police in Rowlett, Texas, that never happened. "There were no arrests at all during that time period for that type of crime," says John Ellison of the Rowlett Police Department.

According to Cassandra Terrazas the ambulance was rented, the blood was fake, and everything was scripted right down to the person who fell off the boat. 

"You're positive he had not been stabbed?" asks Matt Meagher.
"Yes. I'm 100 per cent sure he was not harmed at all in any way," says Terrazas.

But when Meagher told Executive Producer Bobby Goldstein what our investigation found, he still insisted it was all real.

Meagher: "The whole thing was faked, wasn't it?"
Goldstein: "No".
Meagher: "We have two people, on the record, directly involved in the scenario, who have told us everything was faked."
Goldstein: "That's a surprise to me, and that is the first I've ever heard that. It was represented to me that this incident actually occurred."
Meagher: "You represent in that episode that the young man was arrested and taken away by the Rowlett Police Department."
Goldstein: "I think so."
Meagher: "It never happened."
Goldstein: "I don't know that to be so."
Meagher: "Did you visit him in the hospital?"
Goldstein: "I think I did."
Meagher: "What hospital did he go to?"
Goldstein: "Matt, I don't remember all this. But I can't agree with you that it didn't happen."
Meagher: "If the host of my television show was stabbed and I visited him in the hospital, I would remember."
Goldstein: "Listen, I visited Joey. My recollection is that he was very pale, very frail, very scared, but he was very courageous. But let me say this, if it was all poppycock, it sure did great in the ratings."

The host of the show Joey Greco hasn't responded to INSIDE EDITION's requests for an interview.