Tori Spelling realized everything changed in her marriage to Dean McDermott when they started having kids — and then he wasn’t getting enough attention from her.

That’s what viewers saw the former Beverly Hills 90210 star sadly admit on Tuesday night’s episode of their Lifetime reality show True Tori, in which the couple tries to fix their crumbling marriage in the wake of McDermott’s cheating scandal in Toronto.

And in the saddest moment of the series so far, McDermott was shown trying to explain to the oldest of their four children, son Liam, 7, why he was writing mommy a letter of apology.

On the episode, Spelling, 40, admitted to Dr. Ann Wexler during their ongoing couples’ therapy that she had a hard time revealing her emotions to McDermott, 47.

But she told McDermott she wanted to know his true feelings about his fling, Emily Goodhand.

McDermott told Spelling he had met the other woman at a charity event.

“Emily was there and we got to talking,” McDermott said. “I wasn’t attracted to her — it was just like a warm body.

“I felt like I was on autopilot.”

As Breaking Celebrity News has previously reported, love rat McDermott had no problem criticizing his sex life with Spelling, saying because she was pregnant, he simply wasn’t getting enough!

Spelling cried, “That’s super unfair, I’ve been pregnant for six years.”