Back in May, Mackenzie McKee caught her husband cheating on her with her cousin.
Now, it's unclear what exactly transpired between the two parties -- Mackenzie initially said they were having sex, but then backpedaled on that accusation -- but whatever it was, it was bad enough that Mackenzie filed for divorce from the father of her children.
Now, the Teen Mom star is coming forward with new details about the situation.
For starters, it seems the cousin in question is "a lot older" than her and Josh.
And apparently, Mackenzie confronted her when she learned of the infidelity.
Here's everything we know about the situation:
1. A Woman Scorned
Mackenzie McKee was understandably not happy when she learned her cousin was having an affair with her husband. Now, she's opening up about exactly what happened when she found out.
2. Trouble In Paradise
It's still unclear if Josh and the unnamed cousin actually slept together or simply carried on "an emotional affair," as Mackenzie has claimed.
3. What Was He Thinking?
Either way, the timing couldn't have been worse ...
4. The Toughest Times
Mackenzie lost her beloved mother, Angie Douthit, back in December. Shortly thereafter, she learned of Josh's infidelity.
5. The Ultimate Betrayal
Mackenzie now says Josh was sneaking out to her cousin even during Angie's final days.
6. Going Off
When Mackenzie learned of the affair, she posted a lengthy Facebook status in which she denigrated both Josh and her cousin as cruel, dishonest people.