courtney,
I am so glad you're protecting your kids and yourself from his choices. You can't and won't change him.....but staying with him you CAN ruin your own chances for happiness, and your kids' chances at growing up without the adult-children-of-alcoholics traits that so many of us have here. (see the ACOA board on this forum if you want to learn what THAT looks like....it's not pretty)
Wishing you luck, and strength - keep that phone off!!
GL