The echo of Holiday in Peyroux's voice tells the listener that her lovesickness is not the first case, or the last.
He takes his attractiveness for granted, breaks hearts out of thoughtlessness rather than malice, and has developed no antibodies against lovesickness.
An article on "Erotomania," for example, turned out to be a scholarly study of lovesickness by Psychologist Theodor (Listening with the Third Ear) Reik.