I will be telling the girls what is going on so they don't grow up believing all the nasty things you will choose to say about me. My children are going abroad to a different country for 6 weeks with now a huge group of people who will despise me for no reason whatsoever other than you decide to smear me. I've never wanted to be more vile and nasty than I do right now. I wish I could fu**ing rub it in that I had been fu**ing him or carrying on. I wish that were true so I could fu**ing hurt you.
Even if she's not having sex with the guy an affair is an affair. She is quite clearly carrying on an affair with him. Sex would just be a formality at this point. It's strange how people justify their behavior, such as having oral sex so they can say "we didn't have sex" as if oral doesn't count. Or spending intimate time with someone but saying it's not an affair because sex hasn't taken place (yet). Anyway you are right to ignore rants like this, there is nothing you could say that would placate her.