Tori Spelling believes Dean McDermott cheated on her, cries about it

Tori Spelling is furious at her husband Dean McDermott.

A source claims that the former 90210 star believes reports that McDermott had sex with another woman before Christmas and she can't strop crying and screaming about it.

“She is refusing to comment on the cheating rumors publicly, even though she believes Dean did cheat on her,” sources told RadarOnline via Fox 411. “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.”

Two days after rumors broke about McDermott's alleged affair, Spelling shared a video of her kids opening Christmas presents. But according to the source, Spelling is just trying to spare the children from finding out about her relationship problems.

“Even though she is trying not to fight in front of the kids, it’s impossible,” the insider added. “She has been crying and screaming at Dean, and saying he has ruined everything, including Christmas.”

The 40-year-old actress has always been insecure about her relationship with the Top Chef host given that they began their relationship as an affair when the two were married to other people.

“If the phone rings and it’s a girl’s voice, I have to ask if he’s having an affair. Dean tells me over and over again that he would never do that,” she wrote in "Uncharterd TerriTORI," a book she published in 2010.

“She has never completely trusted him and has always kept very close tabs on Dean. But despite all that, Dean still cheated,” the source added.

[Radar Online via Fox 411]