I'm with you, man. I have a WAS who has told me several times that it is over. We've been to counseling and tried in the past, but it was I that didn't change. I know she isn't the problem. I'll admit that there is blame on both sides, but my inaction was what lead to my current situation, which is headed toward divorce.
I've givern her space and let her go. It's the toughest thing I have ever done, but I did it.
I guess my advice to you would be to look critically at yourself. You both obviously fell in love with eachother in the past. Why was that? If you can find what she fell in love with before, you can focus on rekindling those attributes in yourself.
It's tough, and you need to be honest with yourself, it's what I am doing now, but it might be too late for me...no idea yet. No papers filed, but for the last few weeks it has been "any day now".