Just reading up on your sitch. The phone call with the brother sounds like your W is confused and having a really difficult time. You can't be the cause of ALL of her problems. Don't get me wrong, I am sure there were things in your R that lead to this but certainly not all. Sounds like there are other forces at work here. Be it depression etc.
Keep DB'ing. Even if it seems hopeless, read some of the success stories on here that were way worse! Wish my H would have read the book and worked to try to save our M.
Even if she doesn't keep up with the MC are you going to keep going to IC? I don't mean this in a bad way but I know that seeing my IC is really helping me work through some of my own feelings and get my head straight. Just a suggestion.
(((Stew))) you will get through this! We all will.
Me: 30 EX-H: 37 DD: 5 Separated 6/07. MC for months, EX-H quit MC. Divorce Final 8/14/08. Trying to move on with new life.