You need to do what is best for YOU. I am so concerned about your sitch. You are handling this all so well. If you feel you've reached equilibrium over the last few days by being 'done' with your W, then by all means, DON'T call her back. As you said, the kid's are with their grandparents. W can see them there if she feels so inclined.
Peace is what you deserve (and need) right now.
Me: 35 Him: 43 Together: 19 1/2 years 1st Bomb (IDLYAM): March 2011 2nd Bomb (OW): April 2011 He abandons home/bills/everything: May 2011 He's bought a new house for OW: September 2011