Can you give us a few specifics about your likes/hobbies/things you and W do together? It would be easier for us to give suggestions on how to rekindle some closeness and affection.
Do you two have regularly scheduled time to go out together and have fun? What do you like to do together? Are there things that you or she have "always wanted to do" but never gotten around to it? Travelling? Waterskiing? Night school? Music lessons? Antiquing?
It may be that your marriage needs to break out of it's constraints and take some fresh paths, or it could be that if YOU do that yourself it will change the dynamic and she will see you in a new light (which seems to me to be in the heart of divorce-busting).