I think the one thing that all of us LBS don;t really think about is how will it be IF and WHEN our spouses return? I honestly believe it will be just as hard as you are describing. Trying to rebuild trust that was lost, and trying to feel like things are better when the pain is still there. Communication and doing it properly without making the other person defensive is the key, but it is also a skill that has to be learned. I don;t have any answers, but I can totally relate to what you are sharing. I too have times when my mind will go back and I will think to the days of the decit and the lies and betrayal. I try really hard to get those thoughts out of my head before they take over. Prayer helps!!
There can be no testimony without a test. I am praying to go through this test and come out the other end with a new and better marriage then before.