I came to similar milestone a few weeks ago, for me it was finding out that there is now a 'male friend' in the picture.
I was seriously tempted to file. My father convinced me to hang fire. So I held off and just changed my goal to an amicable D, filed by her.
That has changed things, I really don't mind if I don't see her or speak to her, in fact in a way I'd prefer not to for a few months. I check myself to not be uncivil when we are in contact (remembering my new goal). I no longer beat myself up about errors I make. It's liberating.
It's another level of letting go.
Maybe worth a try as step before you go ahead and file?
