I mostly echo Mach's questions and suggestions. Except I'm not sure you're really searching for an ending. Not "closure" in that sense. More like closure in putting your emotions on those feelings. Closure in that you can talk openly about it with Ms W and you two can reconcile (that's not a romantic relationship, that's reconciling your pains, hurts, etc).
You do seem to need to still forgive you and put your own feelings to rest. Which comes first? Your feelings or reconciling with Ms W? I'd say they go together, no?
She may not want to talk about it. But for you, you may need to risk some things to "balance" the equation and reconcile with her.
One thing that stuck out - you mentioned she had an EA/PA after the BD. Can you reconcile that bit for now? That seems a bit odd to me and might be a place to start with your feelings.
I totally get you feel the need to do this, Wonka. I kind of suspected it a long time back I do hope it helps you gain some peace and lightens the burdens you carry (what? You don't think you do? )
Peace, AJ
"Our lives begin to end the day we become silent about things that matter" MLK Put the glass down... "Yesterday I was clever so I wanted to change the world Today I am wise, so I am changing myself."