Fantasy is actually a very small footnote in the whole debate- and I'm sure with time it could be easily broken.
The more difficult thing to mentally break with, though, is the dillemma of having feelings for something that doesn't exist: what I thought she was, rather than what she truly is. Because honestly, there's no chance in HELL I would ever get back together with her, but ARRRGH GET OUT OF MY HEAD!!! (smacks forehead repeatedly like a schizophrenic)