"They have issues that are hard to remedy," a source tells PEOPLE of Tori Spelling and Dean McDermott, who are weathering a rough patch in their marriage
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In 15 years of marriage, Tori Spelling and Dean McDermott have weathered ups and downs, but multiple sources tell PEOPLE that they've hit a particularly rocky road.

"They've grown apart," says a source of the couple, who are parents of five children: sons Liam Aaron, 14, Finn Davey, 9, and Beau Dean, 4, plus daughters Stella Doreen, 13, and Hattie Margaret, 10.

"They have issues that are hard to remedy. And they don't have the same relationship they once did," the source says of Spelling and McDermott.

In recent months, McDermott, 55, has been noticeably absent in Spelling's social media posts and was not included in a photo of family Christmas stockings or in the family's Christmas card.

"Things have been chilly between them," says an insider. "Tori is trying to figure out what to do next. And she's always focused on her kids."

Tori Spelling and Dean McDermott
Credit: Amy Sussman/Getty Images

Sources say that one major sticking point is McDermott's 2013 affair, the fallout of which was covered in the couple's reality series, True Tori.

"Tori still has major trust issues," says the insider. "Part of their relationship was never fully repaired after he was unfaithful."

tori spelling
Credit: Rachel Luna/Getty

Now, time will tell what's ahead for McDermott and Spelling.

"Tori doesn't want to break up her family," says the source. "But marriages with five children need to have a lot of trust."