It's easy to understand why some people have grown up with the impression that "I Will Always Love You" is a love song. But when it comes to Parton's original version, that's not the case.
Parton actually wrote "I Will Always Love You" about parting ways from her business partner and fellow country star, Porter Wagoner. When Parton was trying to make her way in Nashville, Wagoner took her under his wing and helped her become a star.
Once Parton made the decision to separate from Wagoner, she wrote the song about the ending of their professional relationship. Years later, she serenaded Wagoner with a performance of the song during his 50th anniversary celebration at the Grand Ole Opry.