How do you get away?

Try to do this quickly, got two good friends, we are all in our 40's, we all have sons that hang with each other, two of us have husbands the other one is single. One talks terribly about everyone of us to each other. She told me something the other day very confidential about the other one, I didn't like it so I told the other one about it, but made sure she understood I didn't want to break up a friendship just wanted to give her a heads up not to share that kind of info. It was not my business. In turn she hasn't spoke to the other one. I was encouraging her to call her. She finally has called but they seem to have turned on me and also the boys turned on my son. I am so upset they brought the boys into this. I hate the drama and immaturity. I know eventually they will call and want to get together. They treat me differently when its 3 of us, but very sweet when its only me and one of them. How do you just drop both of them discreetly without any drama? I am done!!!