For what it is worth, I am starting to feel like protecting yourself financially in the midst of all this chaos IS standing for your marriage. I think you can do both. It puts you in a stronger position in the event that the WAS decides to put out serious effort to reconcile somewhere down the road. One of you has to have the financial house in order (at least one of you) as best as you can because adding monetary problems to an already fragile relationship just adds more stress.
I don't think it's that you're not capable of dealing with this, as you as above. You said you went through hearing things and then anger and such and got yourself back to your "center" very rapidly. So you're capable. I think it's more a question of this is what you WANT to handle anymore.
M45 Bomb 6/09; EA 6/10; Divorced 1/11 Proud single mom of 7 little feline girls and one little feline boy "Fall down 53 times. Get up 54." -- Zen saying