Is physical and abstract desire a factor in defining a relationship? Despite my love for you, I still think of others.

We meet, we get to know each other, we fall in love; we kiss, we embrace, we get physical, and we enjoy the moment, but does it mean that we really have each other? Is it possible that all kinds of desires, both physical and abstract, can make a difference in a relationship? Because even though I love you, I still think of others.