Everyone has brought good examples here and Mrs. H, your posting brought home a few thoughts of my own. My xh was actually rational enough to admit that it wasn't anything about me or what I had done, but it was him that had the issues.
Well...as he moved along in the separation, etc., he would use to say that I didn't kiss him goodbye stand at the door wave goodbye to him every day he left for work. Keep in mind, 99% of the time I left prior to his departure. He never mentioned that this was a pet peeve w/him the entire 25 years of our marriage.
I haven't got a clue as to the other skeltons in the closet he pulls out these days to justify the divorce, but he's the ow's problem now. Had he talked to me, whatever was bothering him, could have been corrected, but heck, I couldn't read his mind and a crystal ball wouldn't have helped either.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.