But in the modern world, in which the internet has become a vehicle for all manner of impropriety, she regards this kind of behaviour as perfectly acceptable.
We have encountered one another via an internet dating service established for the sole purpose of enabling married people to commit adultery.
Reading between the lines, I suspect she wants to meet again.
Sadly, I feel I have got all I want out of our brief relationship - two cups of coffee and a short conversation - and it's time to move on and find someone new.
So I paid £119 for a month's membership, giving me an entre to thousands of faithless females.
But it claims to have more than 100,000 members in the UK.Many of them are middle-class, many have young children.And all of them are looking for an opportunity to betray their spouses. But I wanted to find out what sort of woman uses such a site.But she is an old hand at this type of encounter and tells me she's met many men through the site, and that I was probably the only one who hadn't lied about my age."Sophia" tells me she thinks relationships have a shelf life of about ten years before boredom sets in, but that she stays married to ensure her children have a stable home.