Maybe you could bring this up with the C in you individual session. You could ask that it be explained why it seems in one session you are left feeling you are being adviced that W has some issues to work through, while in the other you feel you're being told it's you with the issues. And all the while, you don't understand what to do with the conflicting information. Of course, don't let me put these words into your mouth. Do this only if it makes sense to you.
If the C is spending the time in your personal sessions trying to help explain your W's behavior instead of trying to help you be a better Marcum, maybe you need a different individual C, while keeping this C for couples work.