It is unusual for affairs to go on indefinitely.
James started sleeping with one of his coworkers when he and his wife were going through a trial separation.
James wants to avoid an expensive divorce.
James breaks up with his coworker and starts going to couples' therapy with his wife.
James continues to see his coworker while still living with his wife.
James and his wife eventually reconcile most of their differences.
James' wife discovers the affair after a decade and throws all his stuff on the lawn.