Jarrod exists, first and foremost, as commentary on misogyny and romanticization of abuse in the genre, which means that any indication that your love for him is capable of changing him undermines the character's reason for existing in the first place. (I specify "your love for him" because outside of physical attraction or the thrill of the chase, I just don't get the feeling he actually likes MC all that much?) He also, frankly, lacks the self-awareness to reflect on the possibility of change as necessary; why would he, if he already gets everything he wants? (Gisette, whatever her other flaws, does not have this problem.)
Edited for formatting/minor rewording.