18 month marriage has been limping along basically since its beginning. We're in the final act now.
How do you cope with the feeling that a) you're so exhausted that you are ready to roll over and stop fighting to save the marriage and b) that you want to keep on returning to the dialogue to say 'er, no. Actually, I think you were, quite reasonably and literally, 99% to blame...and, no, you're wrong about Y, because actually Z happened...'?
God, just wish I had never met him.