Something I didn't mention in my previous post is that the betrayers have moved back into town! When they first got found that did the 'decent' thing and moved out of town. At least that way, myself and her ex didn't have to face the constant humiliation of seeing them on our doorsteps.
Unfortunately, to make their presence felt by all and sundry they have decided to move back. They feel they have nothing to be ashamed of now and in the 'interests' of the children it is probably best that they live nearby. Great!