Who is the "Chicago" boy in the novel, After the Kiss?

Throughout the novel Camille talks about the boy who should remain nameless in Chicago. This boy turns out to be Camille's boyfriend, a young man she cares for deeply but has decided to leave in the past to avoid future pain. However, Camille cannot forget this boy and in trying to replace him with a new boy, she ends up destroying Alec and Becca's relationship. In the end, Camille contacts this boy and tells him she is coming to see him over spring break, making it clear to the reader that she has chosen not to burn that particular bridge.