Do you think that these two sayings are two sides of the same coin and that “Absence makes the heart grow fonder” is just a nice way of saying that “Familiarity breeds contempt”? Or do you believe that these two expressions have polar opposite meanings?
No, for me “absence makes the heart grow fonder” is sweet melancholy about missing people and/or a place. “Familiarity breeds contempt” to me is more routine based and about going through the motions over and over again.
Though I much prefer the Slyvestor McCoy misquote “absence makes the nose grow longer”.