I know Dan. I can't even imagine the pain you're going through right now. But you are important. You are something even if you don't have your wife. Remember, it's not you that's making her cry. It's the WTS's crazy teachings.
Your actions will show that you love your children, even that you still love your wife. Although the pain may feel for the moment unbearable, you will get through this. You have to get through this for the sake of your kids. They will end up better off. Be a good father (which I'm sure you are). In time, they will come to understand why you made the choices you did and they will have something that maybe you didn't, a choice whether to be a JW or not.