*looks up* "amour fou". Hmm… excessive passion. Could well be. Perhaps that "codependent" doesn't have a clinical meaning makes it an "easy" word to use in when describing them. Even the word "dependent" seems to somewhat describe their relationship.

Thanks for that. Never heard that term before and I would say that some fans would agree that maybe that is what they have (I certainly know I seem to have it when it comes to the show!)