While her leaving feels very personal, try not to take it so much that way. It was you and her in that situation, at that time and place. You are not that "thing" that happened, whatever it was.
Take responsibility for what you need to; that doesn't include wearing a hair shirt. Become aware of you and your actions and reactions.
I mean let go, just as she has asked.
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss