Tori on Dean's Cheating: I Can Never Give Him Enough Sex

Dean McDermott admits cheating on Tori Spelling in new reality series.

We're finally getting a first look at Tori Spelling and Dean McDermott's new Lifetime reality show True Tori and these sneak peek clips reveal high emotions and Dean's admission that he cheated on Tori.

Tori Spelling to Document Marriage 'Crisis' in New Reality Series

McDermott -- who entered rehab earlier this year following reports of his rumored cheating -- admits being unfaithful to his wife. "That's my worst nightmare, I cheated on my wife," he says tearfully. "I was out of control. Sex was an escape, just like drugs and alcohol." 

Tori responds with her frustration about not being able to fully please her husband of eight years. "I can never give him enough sex. He's never going to be happy with just me," she says, also in tears. "I'm well aware this might not have a happy ending."

Watch the video for more from True Tori, which premieres Tuesday April 22 at 10 p.m. ET/PT on Lifetime.