It's not realistic to think he's going to tell people the real reason you two separated. It'd be nice if he would I know, but he's not going to. I simply can't imagine ANY man telling people that they separated because he wouldn't have sex with his W.
I know your bruised female ego would simply love for people to know the truth, and for him to tell them that truth though wouldn't it? Try not to worry about what he says to others....if someone says something to you and you feel the need to clarify then do so, otherwise relax about it.
I wish you the best though. It seems to me that many of us on here are experiencing some of the withdrawal you are talking about (myself included). I'm hoping I don't find myself in a similar situation in the next few years....right now I'm trying to prevent that as hard as I can.