like the others I would make sure you are protected financially during the separation period. As far as making any decisions about D - like I said to Pearlh - you came here for a reason. If you believe that your M is a commitment that you agreed to honor in all cases - then you need to hang in there. Ask yourself why you are here? What were your goals? How have you changed them as the situation changed? Where are they now? and How could you update them? You went dark for a reason - to get her back... why stop waiting? just because it isn't in your timing? you have come a long way - keep up the good work - the kids will learn much from how you deal with your M. Just my thoughts.
Sending some hugs for the tough time you are having.