Inspiration for writing can come from anywhere. Sometimes it's people I observe at the store or conversations that are overheard. Sometimes it's a scene in a movie. For me, music is a huge trigger for inspiration. More so when there is a message I can relate to in the lyrics.
Chely Wright's message in this song has been the cause of quite a few late night writing sessions. If music moves you as well, you will understand why this means so much. If you are in a long-term relationship it may hit you harder than most if it hits you at all.