Dan, make sure the kids are ok and then casually leave the house. Just a cool, See you later. No discussions. Go find something(anything) to do. If she tries to text you to come home to watch the kids so she can go out, ignore her. Stay out. Only go home when it's past her bedtime. Then just go straight to your own room. No discussions.
Do not talk or text her or any of her friends. If you need to talk, call one of your own friends. Remember, your W is not your friend right now.
We've all posted about what you need to do. Go back and re-read them. Be patient with yourself. We all slip up from time to time.
