I very nearly decided not to post on this thread again, however your last post is so riddled with daftness that I couldn't leave it. I will (probably) not respond again, however (although I'm not guaranteeing it).
So here goes:
Firstly Charity, please don't call me 'bonkers' because you have a different opinion. It's insulting to me and insulting to people with mental health problems.
I have mental health problems, and I'm not offended by it.
I didn't mean that you were bonkers, I said what you were saying was bonkers.
Also, the OP is clearly not 'a nutter' as you so charmingly label your ex, she is a woman who is allowed to express her fears and concerns and I happen to agree that, if her gut instinct is telling her that something is not right with this one 'friendship', then it is likely to be true.
I did not label OP a nutter, that is wholly your inference.
Everyone is of course entitled to express fears and concerns. But when those fears and concerns are not backed up by evidence it is also rational to ask how realistic those concerns are.
I disagree that gut instinct is necessarily a reliable guide to the actions of others.
No, these are the actions of a person trying to rationalise the discrepancies between what they are being told and what they see going on.
You are ignoring the fact that snooping on DH's emails has turned up absolutely nothing that even hints at a guilty secret. Unless of course, he's laying a false trail and knows that his wife is secretly reading his emails. That's it! Perhaps the emails are in a secret code! Start working on decoding them at once, then his game will be up! By God, we've got you now!
Sheesh.
In almost all cases of affairs, emotional or otherwise, where the guilty party lies to their partner, the partner knows that something doesn't add up.
This isn't sound logic. For a start, he hasn't been caught lying. For a second, suspicion does not equal guilt.
They can often go snooping and spying and find nothing for months on end. Did you notice that OP said she almost wished she did find something incriminating because then she would have evidence? This is a perfectly normal and natural reaction when someone is cheating on you but won't admit it.
It's also a perfectly normal and natural reaction for a paranoid individual whose increasingly convoluted theories are threatened by the evidence. Or lack thereof.
Now, he may not be physically cheating(yet) but he is continuing a relationship which is causing his wife distress. Why?
Perhaps because she's being totally unreasonable and he hopes that the forthcoming dinner which OP, not DH, initiated (ever heard of mixed signals?) will go smoothly?
What's he meant to do, say: "Yes, well, my wife did invite you to dinner, but now she says I must never talk to you again. Sorry and goodbye, although we still have to work together."
Spelled out like that, don't you think OP looks a bit ... odd?
Why does he fob her off? There is more to this.
Ah, so he's not acting guilty, therefore he's guilty!
This is witch-hunt logic at its finest and although I could be wrong I think you and others are doing OP a grave disservice by encouraging what quite frankly appear to me to be delusions.