Recently, DH and I have been spending time with an old (female) university friend of DH's and her fiance. The friend is a normal part of his social circle, the fiance is an "incomer".
Our Friend has been confiding in me quite a lot about some misgivings she has about her relationship, which revolve around her ILs. She thinks it is the wedding planning bringing out the worst in them.
All of this was dealable-with until I realised that I know the fiance's ex-wife quite well through work - they had divorced before I met her, so I didn't link the two to begin with.
This would all be embarrassing enough, but I know through Ex-wife that Friend's misgivings are very likely to be completely justified - history is repeating itself.
I know confronting her with this information will not help, but I'm not sure I can carry on listening to her going on about her arse of a FFIL without saying something. I also enjoy her company, and don't want to push her away for the sake of not feeling awkward. In the very least, I would like to tell her I know Ex-Wife, as Ex-Wife has worked out that I know Friend.
What on earth can I do here? I am positive that Ex-Wife is not causing trouble, as she told me most of what I know before she knew about my friendship. I do not know how much the fiance knows about the situation.