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: