OP: You've gotten some good advice. Now I'm going to give you some bad advice:
You are about to go through a divorce. That is also called a war. Hit first, hit hard.
Keep documenting everything. File for divorce. Ask that she find a different place to live as her behavior is disruptive to the kids. She is not the person you fell in love with. She is the enemy and you need to destroy her. Snag the kid's college fund and hire a PI. Hire the best attorney you can and knock her on her @#$ (legally not physically) and keep her there through the entire process. Seize the initiative and the high ground.
Cancel the credit cards. Take all the money out of the joint accounts and open separate accounts at a different bank. Cancel the car insurance, give away the dog.
Remember, it isn't enough to win. You need to crush.
Or you could take the good advice.
DC