Dr. Phil has Erin join him on stage. He asks her, "Tell me what's in your mind and your heart at this point?"
"I'm just done. I can't keep doing the same things. It's insanity," she tells Dr. Phil.
Dr. Phil asks Erin if she thinks Marty has done something inappropriate.
"I don't know and I don't even care anymore," she tells Dr. Phil.
"Why do you not care?" he asks her.
"It's all such a big mess and there's so much, so many lies and so much deceit, and so much hurt. That this is just the final straw," Erin says. She wonders if Marty is thinking, "'OK, just in case it doesn't work with Erin, I'll just stick this woman back here because she still likes me.'" She tells Dr. Phil, "You know what? It doesn't matter whether he did anything with her or not. What matters is he chose not to tell me."
"I want you to tell him how it makes you feel to know that he has this secret with that woman," Dr. Phil says to Erin.
She addresses Marty. "You chose not to be a man and stand up and say, 'Here's what happened.' No matter what happens to you in your life, you've got to get real with yourself." She ends her comment saying, "You're losing your family, man ... You can't keep doing this to me. I'm finished. I've checked out. I'm sorry."
"It hurts me Marty. You had a relationship with this woman. It was intimate during a time when we were having difficulties, and now you're having this relationship again. How do I know it's not going to start up again," she says to Marty.
She tells him that she also hurts for the girls. "It makes me really sad that you're such a poor role model for them. I am so hurt about that, but at the same time I'm not going to allow you to hurt me anymore. You cannot do that to me anymore. No more."
Katherine replies, "I'm proud of my mom and I want her to leave my dad because I don't want to take this anymore," she says. "I shouldn't have to explain why because it's right there."
"It makes me sick that someone who is trying to right themselves would lie about something so stupid," Alex says through tears. "I'm so angry. I'm not upset, I'm angry," she explains.
Katherine follows this up with some strong words. "Dad, you just did lose your family because you are not my real dad if you're going to be like that," she says.
Dr. Phil asks Marty one last question. "Marty are you guilty of infidelity or are you guilty of poor judgment?"
"Poor judgment," Marty solemnly says.
Dr. Phil tells the family to digest what has taken place. "Take a really deep breath, take a major step back, and think about everything that has transpired and what has gone on," he says. "Take a deep breath, and we will continue."