Bringing it to life brought only complications, albeit occasionally exquisite ones.
After a couple of months I had to end it – and it was after I had made this decision that my husband found out.
Soon, I was spending hours in the parallel universe of cyberspace, often through wonderfully wide-awake nights, uninhibited in a way I never could be in reality.
I told no one, immersed and isolated in my secret life. In moments of fleeting clarity, I wanted to understand what was happening to me. Was it just my marriage problems, or was there something deeper causing me to behave that way?
He discovered messages on my phone and so I sat him down and poured the whole sorry tale out to him, feeling I was stamping on his heart with every word. I spent a lonely Christmas at my mother's house with nothing to do but wonder how I had got myself into this situation. I started therapy, and learned just how dysfunctional my life had been, and so little wonder I kept making new problems for myself.
I began writing everything down, to help make sense of it, first for myself, then for others.
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.
And for a while at least, it all felt harmless and innocent, and fun. My father leaving didn't help, and for the first six months of my life I was placed with a notional "auntie", a family friend who became my surrogate mother throughout my childhood.Mercifully, the kind and complicated man I was married to focused too.I'd always heard that you have to work at a marriage.And so our long-nurtured virtual affair became real.He was young and beautiful and I couldn't believe that he wanted me.
I was fortunate enough to get another chance to do so, and I'm working at it now. Turned On By Lucy Dent (Doubleday, rrp £14.99) is available to order from Telegraph Books at £12.99 £1.35 p&p.