Tori Spelling and Dean McDermott are not commenting on the cheating rumors that are beginning to plague their marriage, but multiple sources reveal there is trouble in paradise.

According to US Weekly, McDermott slept with a 28-year-old Canadian woman named Emily Goodhand while he was in Toronto on business. 

"He told me he and Tori had a sexless marriage," Goodhand told US. "I believed him."

The pair allegedly spent a couple of nights together, and Spelling reportedly suspects the rumors to be true.  A source told RadarOnline Spelling has always had a feeling that McDermott would cheat on her, even though they have been together for seven years.

"It's all a calculated plan on Tori's part...she is refusing to comment on the cheating rumors publicly, even though she believes Dean did cheat on her," an insider told RadarOnline.  "Tori is obsessed with having a picture perfect family, and thinks it's a big part of her image. Commenting or addressing the cheating would taint that image. Things are very tense in the house right now, and Tori is making Dean's life hell."

Spelling, 40, and McDermott, 47, are parents to four young children: Liam, 6, Stella, 5, Hattie, 2, and Finn,1.  The former "90210" actress is trying keep the peace for the sake of their family, but the alleged tension is too much for the couple to handle.

"Even though she is trying not to fight in front of the kids, it's impossible. She has been crying and screaming at Dean, and saying he has ruined everything, including Christmas," the source told RadarOnline.

"Sadly, Liam and Stella know their parents are fighting and it's only a matter of time until they find out why," the insider added.  "Dean even offered to move out, but Tori wouldn't allow it. It's a very unhealthy environment, and the kids are being impacted by it."