Comatose:
because I knew what I was going to say and what she would say and then I would say
This may be delayed memory formation, resulting in remembering it before the actual memory of experiencing it has fully formed, giving the impression that you knew about it in advance. The earlier dream would only need to be superficially similar to the subsequent conversations where the actual delayed memory formation was taking place.
Or it could just be a distorted memory of a dream which is later incorrectly recalled as 'exactly the same'.