Only half of today's marriages stick - why is that? The social revolution has made marriage fairer and unacceptable behaviour more 'frowned upon' so shouldn't our marriages be healthier and more long lasting? Why is it that an institution that forms the basis of society is in crisis? And what can we do to improve things? Here are the 6 questions to ask yourselves if you are preparing for, or are already part of, a marriage. 1...