First of all, the fact that you have been away for a week and a half and plan to be gone another week and a half should prove to be very beneficial to you. You have gone pretty dark and that can be a good thing, (i.e. makes you mysterious, etc.).
Regarding the email, if you want to stay solution focused you are going to have to put that completely out of your mind. Think about anyone who is having an A. We can all imagine what they are saying, doing, etc. Why burden ourselves with all the gory details. Does it make it any less painful? Does it make it any more painful? The fact is, there is an A going on and there is nothing you can do about it. Nothing, except perhaps drive your S further away by confronting.
So if you want to stay solution focused, ask yourself what you can do to improve your R with your S. Part of your answer should include what you are already doing; (i.e. creating significant space between you and your S). Something else you can do is reflect on what role YOUR behaviors may have played in causing your S to seek the company of another person.
Think about some 180's that once implemented might provide a glimpse into the new you. Make the hard changes and keep them going and make them permanent. Because even if you don't have the desire to reconcile with your S, those changes are going to be important for you in your next R. Plus, it gives you something to focus on instead of the downer of the sitch you are currently in.
Hope this makes sense.
Try to hang in there. We are all in this together and we will help when we can.
Me51 W53 S17 S14 M22 T25 Bomb-9/11; A-11/11; I move out 11/11
It's easy to find our bottom, it is our top that requires cultivation.
Every rough spot adds to our emotional constitution. -Barney Fife