No one thinks about their marriage falling apart on their wedding day unless there have been hints of dysfunction. We vow to love and obey, through sickness and health, but when things happen, love sometimes takes a walk.
Sometimes the person we marry turns out to be very different once we are behind closed doors. She could be violent; he could be moody. He could have a line of mistresses; she could have an addiction to spending. Her parents might dislike the spouse so intently that they sour the relationship. His friends might be involved in criminal activities that endanger the family.
There are so many opportunities for something to go wrong that it’s amazing when marriages stay intact for so many years. Happy stories can feel contrived and are sometimes so saccharine that readers become disengaged, so bring on the troubles.
Your task is to write a story in which issues arise that lead to the destruction of the relationship. There’s going to conflict which you might want to show through dialogue. You might need to bring in other characters if they are the cause for the problems. Remember to balance dialogue with narrative.
Have fun with this one.