This thread has made fascinating reading, though I oughtn't admit it.
For those of us in middle age as I am, there has been a sharp and unusual change in family structure since childhood.
When I was at school I had one classmate whose parents were not together. I was brought up by a sigle father, but he'd been widowed not divorced.
By contrast, my children are/were at school with countless other pupils (the majority in some classes) who divide their lives between parents who live apart. A common retort when enquiries were made about a football or rugby match were "I'm at my mum's, so I can't play".
I have a niece and nephew who live almost as if from a suitcase between mother's house and father's. Countless hours are spend driving the sprogs between remarried parents in their new homes. We time our journeys to their part of the world to coincide with 'dad time' as the mother is not a nice piece of work and wouldn't welcome a visit from our children anyway.
There are even children among our kids' peers whose parents have re-married, re-sprogged and re-divorcd, so the merry-go-round for shared custody becomes a blur of headlights, teddies left at the wrong house, awkward doorstep meetings and a cacophony of car-door slams.
I am not at all surprised to hear that someone is nervous and /or suspicious about a spouse who cycles with a potential rival. We may be becoming a culture of selfish, self-obsessed, sexually incontinent thrill-seekers.
But on the other hand we may not... I am not an expert.
Thank for listening.