What is the meaning behind song Mon Meilleur Ami by Yelle?

The lyrics of "Mon Meilleur Ami" tell the story of a woman realizing she has feelings for her male best friend. She reflects on their friendship and the moments spent together, wishing they could be more. The repetition of the phrase "Mon meilleur ami" expresses the bittersweetness of the unrequited feelings and the fear of ruining their friendship by confessing them.