One of the things I'm reading right now is Getting Back Together: How to Reconcile with your Partner and Make it Last (Youngs, Goetz). I'm not very far into it yet, but it seems to echo much of the information in DR.
One of the suggestions is to set boundaries and make agreements around the separation - financial, child-related, etc. - including possibly an agreement to remain faithful and discussion of how long the separation might last.
Do you think it's wise to ask an MLCer who feels like he needs a new start and is finally 'getting out' to commmit to not screwing around during separation? How about trying to get an idea of whether they see this as a time-limited or open-ended separation?