Since you can't tell a story about someone until after you break up, the temptation can be strong to break up just because you are eager to start telling stories about that relationship. You can't break up too soon, though, because something even better might happen. You want to have the best story at the next wine and pizza party. So now we know why people have relationships. It's for the anecdotes.
Sex lasts a short time.
Relationships last a few months or years. You can tell the stories the rest of your life.