Consider a situation where Jonh and Amanda (They are friends ) go to a restaurant. John has never been here with a girl before and Amanda has never been here with any male friends. Now John says" I have never been here with a girl". Then Amanda says" Nor have I been here with a boy". Is the sentence said by Amanda correct ?
It is correct, although a bit formal sounding. Here in the US, the sentence "neither have I" is a very common response to "I have never..." statements.