Because, honestly, my love for fictional relationships has little to do with how healthy I think that relationship would be in real life. If anything, the reverse is true.

Yup. While not always the case? It is to some extent. I like soapy fictional relationships - that are abusive, impossible, and can't realistically exist or continue in reality. Nor would anyone in their right mind want them to exist in reality. There are exceptions of course. I too have things that ..ahem don't work for me at all. I mean it depends on lots of factors - such as do the characters have chemistry, do the actors (if it is television or film)..