From the very first meeting, the guilt racked through me.
We would meet in hotels, have sex – mindblowing sex - and then the realisation that what I was doing was irrevocably wrong would set in.
There were redundancy problems at work; my marriage was showing strains; and there was something large and unnameable missing from my life.
I ignored it until I could do so no longer, until eventually, for what felt like the sake of my sanity, I resolved to do something about it.
It's taken me a good while to fully come to terms with what I've done, to understand how easily I fell into the previously unknown world that I would regrettably come to prefer to the real one.
Luckily, after only a short time apart, my husband came back to me, willing to try to put us back together and realising, in all this, he had had a part to play too.
Taking my online affair offline was my big mistake, a transgression too far.
What drew me to the online world was the maintenance of fantasy.
Call 08 or visit Telegraph Books The Big Short, the film adaptation of Michael Lewis' book of the same name about the causes of the financial crisis, opens in UK cinemas this weekend.
I was a latecomer to counselling, having previously considered therapy a largely American pursuit. By the time I reached that landmark age, without children and in a marriage that was beginning to lose its fairytale glow, my daily life was beginning to feel not unlike a soap opera.
And I did, pretty much, and I was perfectly fine - until suddenly I wasn't.
As I have come to learn, most of those who grow up in a dysfunctional relationship are condemned to seek them out forevermore. In adulthood, I had become a rather complicated girlfriend, each relationship beginning well, but then growing fractured and ending badly.
I am bound to say, though, that I wasn't solely culpable. I ended up marrying one of these complicated boyfriends.