Stay away from her family and friends. I made that mistake. Even the friends you think you can count on. They'll just tell her everything and it'll just make you look weaker.
My MIL told my wife everytime I called, even when she said she wouldn't. My MIL likes me, I think, but she'll always love my wife best.
My W had a friend that she grew up with. She move across the country to our area with her H several years ago. I thought her H and I were really good friends. A few years ago I even hired him to work for me. Gave him a real break into the field. He really didn't know much about the IT business at that time. Apparently, he's been telling his W everything I say and then she tells my W. I also caught him in a few lies. People really should learn how to keep their story straight, if they're going to lie so much.
Also, your friends really don't understand what you're going thru. And they really don't want to get in the middle, even when they say they'll help.
Find a good counselor and see them. Get some AD's, I'm on Lexapro, Wellbutrin, and Proprannol. See if your C has a group meeting you can attend. My C lets me go to it for free. Also, try the DivorceCare.com program. They have local meetings. I haven't been yet, but will be going on Wed. A friend of mine went thru it and says that he met some of his now "best" friends.