Dan didn't know if he could believe the words that came out of Amon's mouth, but then again, why would Amon lie?
Plus, the man already figured out everything about him before he even came here to do his job, so Amon must have done his own background check and found out about his wife's affair with his brother.
And it did make sense in a way.
He was rarely ever home, so his wife must feel very lonely at times, and since his brother lives right next door, they talk a lot and are very close.
He has seen it with his own eyes. He just thought that they were close because they were family, not because they were fucking each other behind his back.
It also made sense how she always defended him if he and his brother got into a fight and vice versa.
