Chocolate, I'm in a similar situation as yours. My W and I have had sexual frequency problems over the years, and I suspect an EA/PA. We are not yet in Piecing, as there has not been a spoken commitment from my W to work on things.
A commitment from our WAS would help us feel we have ground beneath our feet. Maybe there'w no commitment at this time, but are you sure there's no action? Progress made prior to Piecing is still progress!
What positives are you seeing in your R? Is your W working-thru her issues, or is she completely in escape/avoidant mode?
My thread is "W at Home, Yet Sleeps Elsewhere," over in the Infidelity forum.
CL
CL 53 W 54 M 20 yrs. 03'-09' Separation + Old Patterns + GAL 10-14' Piecing
"The Master allows things to happen. She shapes events as they come."