I don't have any 'goodbye' related fantasies, I think because I am mostly getting what I dreamed of during the actual relationship, and also because if I have a fantasy (e.g. her being my mother) I tend to her tell her.

I imagine that part of it being 'the end' is that the intensity of the relationship, and our feelings, has lessened because our needs have been met, and that by then these things won't feel so important? But I guess that depends on the circumstances and reasons for ending...