Nick Hornby said this quote

“ You’re seeing someone else, aren’t you? Seeing someone else? How on earth could that explain any of this? Why would seeing someone else necessitate bringing home a middle­-aged woman, a teenaged punk and an American with a leather jacket and a Rod Stewart haircut? What would the story have been? But then, after reflection, I realised that Penny had probably been here before, and therefore knew that infidelity can usually provide the answer to any domestic mystery. If I had walked in with Sheena Easton and Donald Rumsfeld, Penny would probably have scratched her head for a few seconds before saying exactly the same thing. In other circumstances, on other evenings, it would have been the right conclusion, too; I used to be pretty resourceful when I was being unfaithful to Cindy, even if I do say so myself. I once drove a new BMW into a wall, simply because I needed to explain a four­-hour delay in getting home from work. Cindy came out into the street to inspect the crumpled bonnet, looked at me, and said, “You’re seeing someone else, aren’t you?” I denied it, of course. But then, anything – smashing up a new car, persuading Donald Rumsfeld to come to an Islington flat in the early hours of New Year’s Day – is easier than actually telling the truth. That look you get, the look which lets you see right through the eyes and down into the place where she keeps all the hurt and the rage and the loathing... Who wouldn’t go that extra yard to avoid it? ”