Most definately. My inlaws were a prime example. They were great friends but shouldn't have ever been married. They always had little affairs here and there during their marriage. When they finally divorced, they both immediately met (aqnd married) other people. When my mother-in-law died, she and my father-in-law were best friends, and their spoiuses were best friends. They always joked that they loved each other but just couldn't live with each other.