A large number of people, especially young adults and new divorcees, claim they are not looking for a long term relationship. They want to play the field and have fun. Most of them plan to date many different people before they consider settling down. This is generally a successful dating strategy. The dater does not have to worry about becoming involved in another person's life. It works out well for them. It can even work well for the people they meet and date.
Occasionally people end up derailed from their ploy to serial date. They meet someone and chemistry occurs between the two. What was once just an opportunity to have some fun with another person might suddenly turn serious. People are often surprised when this occurs. It is unplanned, but not always an unwelcome event. Many people find a long term partner when they are least expecting it.