How did Hyde come to view Jekyll? And Jekyll, Hyde?

From the text:

Jekyll (who was composite) now with the most sensitive apprehensions, now with a greedy gusto, projected and shared in the pleasures and adventures of Hyde; but Hyde was indifferent to Jekyll, or but remembered him as the mountain bandit remembers the cavern in which he conceals himself from pursuit. Jekyll had more than a father’s interest; Hyde had more than a son’s indifference.