Some people can handle guilt well, and can happily juggle more than one life.
I failed – the guilt was profound – and so began the painful but necessary process of erasing one and focusing solely on the other, the one that had come first.
He was by far the best of the bunch, a kind and generous man, but someone who could also be selfish and unfeeling.
We had agreed, early on in our relationship, that we wouldn't have children. Several friends, however, were convinced that our lack of children created a vacuum.
And then it was finished: our nest, our empty nest. I became addicted to the attention and craved contact with the men I thought I had come to know. But I found out it wasn't as easy as I had first thought. I quit decisively at first, then slipped up, then quit again, craving some kind of patch.
My husband worked hard at his job and, to alleviate its accompanying pressures, developed his obsession with horseracing, gambling and drinking. These conversations quickly developed into cyber-sex, each message becoming more adventurous and racy and allowing me to live out fantasies I would never contemplate doing in the real world. My husband and I became strangers, our lives by now distinct entities. I told myself that what I was doing was essentially harmless.
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'm in my mid-40s now, and our relationship remains every bit as complicated today.I was convinced I wouldn't make a very good mother and didn't want my son or daughter, in 40 years time, to dread calling me, fearful I'd berate them for some emotional crime or other. I'm not sure I entirely agree with that, but it is true that when we bought our first house together, we somehow conspired to buy a wreck that required a lot of our attention and focus. I didn't want an affair, nothing grubby, nothing seedy.And for 12 long, frequently torturous months we painstakingly made it liveable and lovable. I had a husband, a home, yet I was missing something, intangible but palpable. I still loved my husband, but I wanted adventure, excitement, a reminder I was still alive. I began chatting to men online in private chat forums, concealing any obvious indentifiers of who I was but talking about my life, problems and thoughts.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.A late arrival into the world of social media, I nevertheless embraced it as a kind of escape.While my husband spent most evenings catching up on the horse racing he'd recorded over the weekend, I began perusing chatrooms – not in pursuit of cybersex necessarily, but initially more for harmless flirtation, a little virtual attention.Mercifully, the kind and complicated man I was married to focused too.I'd always heard that you have to work at a marriage.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.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.