Tori Spelling and Dean McDermott
04/11/2014 at 05:00 PM EDT
and her estranged husband Dean McDermott are revealing the heartache and pain involved with dealing with his alleged infidelity
in Lifetime's new six-episode docudrama
, True Tori
"That's my worst nightmare [that] I cheated on my wife," McDermott, 47, says as the two are sitting on what appears to be a counselor's couch. "I was out of control. Sex was an escape, just like drugs or alcohol."
In a promo for the show
, Spelling, 40, is seen walking with the couple's children and also sobbing on the couch.
"I'm really mad," she says. "I can never give him enough sex. He's never going to be happy with just me."
McDermott appears confused. "You don't think you deserve me?" he says before reaching over to console her.
Spelling's parting words: "I'm well aware this might not have a happy ending."
will premiere April 22 on Lifetime.