Hi Flight, I think there is some middle ground between these two:
"The silly romantic in me says separate and keep the home fires burning and be nice and maintain a connection so that when she falls again, she will fall into my arms. The other part of me want to treat her like "War of the Roses" and go out of my way to be as cold and mean to her as she has been to me."
For example, you could choose to separate if that's what you want. Equally, rather than keep the home fires burning, you could leave the door open a tiny bit for a possible future R at some point. But rather than her 'falling into your arms' - there would be a clear boundary about doing any work needed to repair the damage caused by poor choices on her part.
Also, remember that a "War of the Roses" approach hurts you both. However, I agree on taking due steps to protect your own interests in any legal process, and doing that firmly and fairly.
It sounds as though two opposing parts are battling within you and the pendulum swings between them - but somewhere in the middle is probably the right place to aim for...
Xx
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus