You may not want to hear this OP, but tread lightly, my friend. Don't air everything to everyone. Don't vilify her to the extent that she deserves to be. The harsh reality is that you guys will probably be back together at some point. You have a child together, they tend to heal wounds, man. So don't trash her to everyone because eventually those same people you slagged her off to are the same ones that are going to have to try to be friendly with her. I know that sounds silly, but so often it's true.
Slinging the mud won't help your situation one bit. You guys are parents and will be for the rest of your lives. The more adult-like you can get through this the better it is for your child. I know you are mad now and rightfully so. But you don't want your support system to hate someone that you have to have a working relationship with for the rest of your life.
Good luck man. My advice is probably all sorts of ******, but I've seen people go through similar things.