Vanessa and Nick Lachey revealed they used to snoop through each other's phones and a therapist told them they 'shouldn't be together'

• Vanessa and Nick Lachey revealed on "The Ultimatum" that they used to snoop through each other's phones.
• The pair shared that a therapist told them they "shouldn't be together" if they were doing that.

Vanessa and Nick Lachey revealed on the reunion episode of "The Ultimatum" that they used to go through each other's phones earlier in their relationship.

The hosts of Netflix's reality dating series opened up about their past when discussing and reflecting on April Marie going through the phone of her ex-boyfriend, Jake Cunningham, during the season.

"The Ultimatum" follows six couples where one person is ready to marry their partner and the other is not prepared to commit to matrimony. Throughout the season, the participants select a new partner from one of the other couples to have a "trial marriage" with to decide if they want to move on or stay with their original partner.

Vanessa shared that she had "mixed feelings" about the situation since she said, "there was a time I did it." It's something that she said her husband, Nick, did as well.

"I remember we went to a therapist and she was like, 'If y'all are going through each other's phones then you shouldn't be together,'" Vanessa recalled. "I was like, 'You're right, I need to trust this man and he needs to trust me.'"

Nick and Vanessa wed in July 2011, after five years of dating, and now share three children.

As previously reported by Insider, on the first episode of "The Ultimatum," Vanessa revealed how Nick's "very public" divorce from ex-wife Jessica Simpson, whom he divorced in 2005, affected the beginning of their relationship.

"The Ultimatum" is currently streaming on Netflix.