why did cal feel closer to adam after cal's arrest?

When Adam retrieves Cal from the prison, the father and son have a long, heartfelt talk. Adam confesses that he thinks he is a bad father to the boys, and Cal confesses that he knows the truth about Cathy. Adam and Cal discuss Aron. Cal thinks that Aron’s deep, innate goodness makes him fragile and that therefore he needs to be protected. Cal promises never to tell Aron about their mother.

Cal feels much closer to his father after their talk.