Two suggestions for you while you wait for Sandi to respond to you. First, please provide us with more information on your sitch along with your and your W. What are your ages? How long married? How old are your daughters?
You mentioned communication issues between you and your W- elaborate a little more on that. Sounds like there may be a recreation time issue with you and your W as well. What other issues do you have with your W? What are the 180's you are referring to? Why is there a 2% chance in your mind your W may be having an A?
I find it interesting that your W is the one repeatedly initiating these R conversations with you about "moving forward with D" despite getting the same response back from you. Why do you think that is? Is she trying to provoke you so you will "explode"? Sure sounds like that may be the case. What is in it for her if you "explode"?
If you haven't already, I'd suggest reading "His Needs, Her Needs" by Dr. Willard Harley. It's a good book that will provide a lot of insight into your R with your W and help you pinpoint what other issues may be going on with you two.
M: 41 W: 39 S: 11 S: 10 D: 4 1st contact w/OM: 1/19/09 EA began: 2/14/09 EA discovered: 3/1/09 I file for D 8/25/09 to protect myself _______________________________