The character had a strong suspicion about Fraser's attachment when he discovered him in the chapel with Geneva Dunsany's coffin prior to her funeral. This moment led him to realize that Fraser had deeper emotional ties that influenced his desires and choices.
As the narrative unfolds, the character comes to understand why Fraser is reluctant to seek his own freedom. The implications of Fraser’s feelings and connections become clearer, revealing a complex web of loyalty and personal struggle that defines his character's actions.