The way it seems is that something tore the relationship apart. It's obvious that growing up can change things within ourselves and in relationships, and some sort of conflict changed this relationship and broke it apart. However, the person realizes that the change had torn the relationship apart and admits that the person was comfortable in the relationship and still cares for the other person ("will I see you again", "warmth of your eyes"). I think this song outlines the consequences of change and recognizes that it can damage the most important things in life.
The way it seems is that something tore the relationship apart. It's obvious that growing up can change things within ourselves and in relationships, and some sort of conflict changed this relationship and broke it apart. However, the person realizes that the change had torn the relationship apart and admits that the person was comfortable in the relationship and still cares for the other person ("will I see you again", "warmth of your eyes"). I think this song outlines the consequences of change and recognizes that it can damage the most important things in life.