In the preview, the former playboy bunny appears sobbing in her friend's arms and confronting her husband, Hank Baskett, about the cheating allegations.
"I didn't do anything," he tells his crying wife.
"No one believes you," she replies, before asking, "Did you think about your family when you did what you did?"
Later on in the emotionally-charged clip, Wilkinson admits the painful truth, "My whole life just flipped upside down."
The confrontation comes after Wilkinson-Baskett learns of rumors that Hank had a tryst with a transsexual model.
According to Life & Style Magazine, Hank made up some sob story that he went to help a female friend who just happened to live in the same complex as his alleged mistress, Ava Sabrina London. Hank apparently told his wife that London made “unwanted advances” toward him while he was there and he felt “violated” afterwards.
— OK! Magazine USA (@OKMagazine) September 5, 2014
This isn't the first clip we've seen teasing season three, which looks to be the most dramatic season yet.
In the first teaser, Wilkinson is seen addressing the scandal and losing it at she tries to keep her family together.
"To her credit, Kendra's not trying to hide any of this from the cameras," a source told E! News. "Literally in one scene, viewers will see her break down and fall on the floor collapsing in tears. It's raw and it's real. She knows her fans expect honesty from her and she's delivering it."
Through it all, Wilkinson's two children "are definitely Kendra's No. 1 priority."
Sources say the 29-year-old ends up believing Hank's story about the encounter with the model, and she allows him back in their home.
“The story is totally absurd. Something isn’t right with her, it’s really worrisome,” said a source close to Wilkinson.
The couple are said to be “100 percent back together.”