Whenever your W is around, perhaps you can try to behave as if she is a girl that you're interested in but don't know yet. This might be tough to imagine because you have kids together, but try to project the parts of you that you would want that woman to see.
Grooming, courtesy, good Dad skills... I'm sure you have all of these things in place. Whatever you do, don't be a sad puppy. Keep your chin up, keep it together, and show her that nothing is going to erode your dignity or your status as your boys' hero.
