We know only four boring people. The rest of our friends we find very interesting. However, most of the friends we find interesting find us boring: the most interesting find us the most boring. The few who are somewhere in the middle, with whom there is reciprocal interest, we distrust: at any moment, we feel, they may become too interesting for us, or we too interesting for them.
That is a Lydia Davis short story (yes, the whole thing) from her excellent book Samuel Johnson is Indignant.