Imageer, I don't think that is an unhealthy exercise to reflect. It says that there were problems with her, that she could have shared with you. She should have shared with you that she was going through issues. Issues with herself, issues with you, issues that she couldn't explain.
I have seen pics of my wife going back over the past couple of years and can see her transitioning from a happier person to a person that looked distracted. My kids were more and more neglected in the sense she wasn't there for them like she used to be. She actually distanced herself from me, the last. She started to "separate" from the kids long before she left me.
Me:56, W:51 D:26,S:24,S:22 Married:18 Bomb 9/27/06 Separated 11/27/06 Divorced 10/6/08 Leaving it up to God