It's hard to say what first attracts Henchard to Farfrae, but whatever it is, he trusts him immediately – not just with his business, but with his personal life and secrets. The two men are practically inseparable…until Henchard's jealousy drives them apart. Elizabeth-Jane and Lucetta are likewise inseparable, despite their contrasting personalities, but Elizabeth-Jane, unlike Henchard, is too good of a person to allow her jealousy of Lucetta and Farfrae to end their friendship.
In the two main friendships of the novel, Henchard feels more attached to Farfrae, and Elizabeth-Jane feels more affection for Lucetta. It seems impossible in the world of the novel for the affection in friendships to be balanced and reciprocal.
Henchard's capacity for both love and hate is stronger than Farfrae's.