Hmmmm....if she moves out with OM and you move back into family home, won't that benefit you in the long run? I mean, it seems like it might benefit you if you want more custody of your kids. Plus she might be more amenable to certain financial issues with the divorce if she thinks she's gonna have OM taking care of her.

This is not a hopeless situation, not by a long shot - after all, she's picked an OM who is into beer and women, he's not gonna be able to compare to you in the long run now, is he? But she is on a journey and you really don't have control over that - the best thing is for you to focus on your own stuff, becoming the best you that you can, and let her see that the grass isn't greener.