ScottB - Your description of the growing distance between you and your W is eerily similar. Lack of date nights, lack of affection. You try hard to please her with her birthday, it goes mostly unnoticed. Then you get absolutely lit up for a litany of reasons, none of which are major.

Recognize that she is going through something. She is giving you so many different reasons for her unhappiness your head must be spinning. If you look to her for answers, you will be increasingly confused and agitated.