not suppose to leave the marital bed only on the grounds of adultry otherwise you leave the other in danger of committing adultry...thats what the w/t teaches.
But I would give her space, respectfully as this would be a huge shock for her, maybe she saw the signs and was hoping it wouldn't come to this, but better to go than to pretend, I think that would do more damage to youre marraige, at least she should have some respect for you for being honest, and not lingering on with a phony suit on. I guess all circumastances are different. Hope things work out for both of you and youre sons.
Cheers