Spelling "is having a tough time. It's been awful," a source toldPeople, adding however, she visited McDermott in a rehab facility on Monday after he checked himself in last month to address self-described "health and personal issues."
"They're communicating. That's a step," said the source.
Spelling, 40, reportedly attempted to avoid cameras when she was spotted visiting McDermott but was still wearing her wedding ring. McDermott, 47, has also allegedly spent some time with their four young children: Liam, 6, Stella, 5, Hattie, 2, and Finn, 16 months.
"It seems like she'll be able to forgive him but I don't think she will ever forget," the source told People of Spelling.
Last month, McDermott issued a statement to the magazine, expressing his regret and reasons for seeking treatment.
"I am truly sorry for the mistakes I have made and for the pain I've caused my family," McDermott told People at the time.
"I take full responsibility for my actions and have voluntarily checked myself into a treatment center... I am grateful to be getting the help I need so I can become the husband and father my family deserves."
During the weekend of December 7, McDermott was in Toronto as part of a press tour to promote the new reality show Chopped Canada for which he'll serve as host. While away, McDermott allegedly had sex with a woman named Emily Goodhand, who came forward with guilt to reveal the details of their passionate weekend, Us Weekly reported.
"He told me he and Tori had a sexless marriage. I believed him," Goodhand, 28, told Us, adding that they "absolutely" used protection when hooking up.
"He was romantic and very complimentary... I'm sorry. I f-cked up."
Spelling was reportedly "devastated" and "heartbroken" after news spread of McDermott's alleged cheating affair.
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The Tori & Dean stars have been married for seven years. Spelling and McDermott -- who also has a 15-year-old son Jack from a previous marriage -- met on a movie set in 2005 but were each married to other people at the time.
After a three-week affair, they left their spouses and wed in May 2006. Because of the way the pair's relationship began, Spelling has always reportedly feared McDermott would be unfaithful to her.