Lou, what people are saying is right - in fact there is a risk that we become the OW in emotional terms to them at certain points n their journey.
And they are on such a roller coaster of emotions. I do wonder if they believe what they are saying when they say it (a bit like a small child) but can't hold on to any feeling for long.
Having said that, certainly better to have calm and positive interactions than abuse fests that some of them specialise in.
What I would say is do not initiate contact. If he wants to talk then you can make that decision. They tend to see contact as pursuit in my experience.