BSC, both are excellent resources that kelaaron mentioned.
It is important for you to understand your value. It won't remove the hurt if she walks out the door but it will help you understand that life does go on if she does AND that it doesn't mean that it is over between the two of you.
She is not sure who she is. She may have thought all she was could be summed up as a wife and mother. That can unnerve a lot of people. Be kind and gentle. Avoid revenge at all costs.
Me:56, W:51 D:26,S:24,S:22 Married:18 Bomb 9/27/06 Separated 11/27/06 Divorced 10/6/08 Leaving it up to God