Just want to make a few comments. Many times, even when someone agrees to attend counseling, they feel like someone is attacking them and finding fault with them...THAT feeling can put them on the defensive and make them lash out. It's possible that's where some of her anger is coming from. If she's feeling like she's been put on the defensive I'm not surprised she'd make the comment about you to the C that she did....just try to let that go.
Also, it's probably a good thing that she speaks to the C one-on-one, you probably ought to do this at least once as well (oops just noticed that you have). Often there are things that can be revealed in private to the C that a person is too shy/embarrassed/scared to say in front of their spouse. That doesn't mean though that eventually those things won't be brought to light with you in the room, the C may even coach her towards telling you whatever it is she said to the C, to you, on her own. IMPO, at LEAST she asked to speak to the C in private rather than not speaking to the C at all and imparting whatever information she has that she feels is important.
As for the breakthrough, it sure is easy to get your hopes up at times like that isn't it? It's so perfectly natural to do that too. You think "things are looking up, now things are going to start getting better." Well yeah, they will start getting better most likely, but not without setbacks....not without some backtracking, and probably not without some hurt feelings from both sides as well. Sometimes it's two steps forward one step back...it's going to take time. Just hang in there, and try, try, try to be patient.
