[quote=TreadThe problem is that W wants to leave the MR. So making a divorce an ultimatum for continuing to associate with OM is nothing more than a joke to her.[/quote]
Who said anything about an ultimatum? Its about what YOU will accept in a relationship. If you wont accept having OM as a part of your marriage and she wont stop contacting OM, then you have no choice but to stop being a part of it, right?

It's only a joke to her, because you arent willing to walk away yet.