What is the main conflict in La Belle Dame sans Merci by John Keats?

Some readers maintain that the poem is really about Keats's confused feelings for Fanny Brawne, his fiancée, to whom Keats could not commit fully. Others claim the story is symbolic of the plight of the artist, who, having "fallen in love" with beauty, can never fully accept the mundane. Either way, the conclusion is the same: however self-destructive intense love may be, the lover has little choice in the matter. Further, the more one entertains feelings of beauty and love, the more desolate and more painful the world becomes.