Jamie is a wealthy, entitled student at Trinity College, one of the boyfriends Marianne dates when she’s not with Connell. Even though he’s not all that intelligent, Jamie acts very condescendingly toward most people. He certainly doesn’t like Connell, who intimidates him both because of his physical stature and because of his history with Marianne. Connell, in turn, dislikes Jamie, especially when he finds out that Jamie likes to “beat up” Marianne during sex. Marianne isn’t even sure she likes this kind of sexual behavior, though she was the one who suggested they try it in the first place—largely, she suspects, because she knows she doesn’t respect Jamie and feels guilty about that, so she wants to prove her willingness to sacrifice her own desires in order to prioritize his. While on vacation in Italy, Marianne and Jamie have a fight that leads to their breakup, and in the ensuing months, Jamie spreads nasty rumors about her and turns most of their friend group against her.