You Deserve Each Other

I gave this a low mark because the  fighting between the couple just went on and on. It was funny, and inventive,  for a while, but then it just got tedious. The fighting went on for between half and two thirds of the book, without you learning a great deal about them or their problems whilst ploughing through it. There is never a clear explanation of what caused such a catastrophic break-down between them.  Well, there are some reasons kind of given, but I wasn't convinced by them, because the author never explained why. Then a resolution happens in the last quarter to a third of the book, which I wasn't convinced by either. I need to believe that a character's behaviour has a reason and is plausible. Too little explanation.