(Smileless, although he concealed it well, he wanted me totally to himself deep down. And I think I know why, given his past.)
I think its equally valid to be able to close a chapter down, and be able to leave it behind, and to want to grieve and heal in our very different ways.
Sometimes we think things are closed, then an event or a person comes along that triggers feelings again.
That's how I happen to function generally in the great puzzles of the "why's" of childhood and the results, but my experience is that each time I re-visit it, its different, and feelings change over time. This helps my healing, but wouldn't for everyone.
Also, some people WANT to puzzle things out more than others. Some people accept it but do not trouble themselves greatly with the "why's". Some people are naturally more interested in "What makes people tick".
You've a substantial puzzle there, Sara! This may be a difficult thing for people to hear, but its only since my mum died, and that was 2006, that I have come to accept, understand, and forgive as fully as I ever will.
My current to be ex of course is still in the "much puzzling" stage........