I share the same experience - My H, who never was verbal or affectionate with me, was the so emotional with OW. It blew my mind (and even his siblings minds) when we saw how he was writing to her.
Now we are in piecing too, and I am doing exactly what Accuray is doing - sending nice emails and texts. All to no avail. No responses from H, or at most a very down to earth one. But still he maintains that he is working on our M and wants it to succeed! To the point that he is willing to go to do a monthly session for life with Retrouvaille.
Its getting me frustrated, but seeing how it is the same with you, I feel better about it! Also, I think about how actions will speak louder than words....
Me:49 H:45 D:12 M:14 T:18 Bomb: 6/26/10 EA: 9/3/10, fizzled out slowly, now ??? 11/5/11 Retrouvaille Finally piecing.... Its peaceful at last, but we got a looong way to go