u-turn: that feeling of wanting to go back in time to undo things is WAY too familiar. I have learned to quash it - usually with a whack upside my own head. There are two people in your dance. Your retrospection is only good for visualizing a better way to do it (whatever IT is) when and if there is a next time.
A thought. The past is real. Just because you failed to make her accountable then doesn't matter. In fact, not overreacting is probably a better approach, all things considered. If her heart changes, and piecing happens (such a bland word for such a glorious thing), that will be the time for accountability. Only then will you be forging a new relationship, because if you get to the other side of this, things will never be the same. Better or worse, but not the same.
Read some of the success stories. Most of them were as hopeless as we newcomers at some point in the DB journey.
Me: 43 XW: 43 T15 M14 D21, SS15, S11, D8 BD: 8/6 EA / possible PA discovered 9/29 D final 10/20