What the heck do you do when OM/OW calls the house

[Tornadoed]

So of course we end up here. W contacts OM and asks about it. OM denies it. W believes him. Not wanting to disbelieve me (at least to my face), W tells me that OM had left our phone number at a friends' place, and that the friend most likely called. Are you kidding me? Why in the heck would a friend of OM's call my house? It's BS, plain and simple, is what it is.

But, it does prove a lesson, it's just like approaching the OP - if the S doesn't want it to end, they're going to believe the OP, and you're just screwed trying to talk about it. Oh well, live and learn.