Lost in translation
It's funny how two people can talk about everything when it comes to the "ideal" relationship, but over time, the two don't necessarily know if they are in a committed relationship or just enjoying "it" for whatever its worth. Most people don't discuss if they are in a "relationship" until it something takes a drastic turn. Some people don't come out and say it, but they like the concept of an open relationship which simply means "You do you; I do me, and whenever it's possible...we'll do each other."