Because they KNOW the man they got still isn't over his ex and they are so jealous they can't stand it. She seems to be SO bothered by that picture of Lexemom - gosh, I thought it was pretty and tastefully done! And she thinks she's won some prize, when the guy isn't even paying his child support? Wonder how much of a prize she'll think she's won a few years from now, when he's stiffing HER on child support????
Of course, they believe what they hear from the WAS - they WANT to believe it so they don't have to face the ugly truth about their own actions. Obviously this OW feels just guilty enough that she has to believe Lexemom was a demon in order to justify her affair. She must be pretty desperate.
