Sam is the boyfriend who Rachel broke up with four years before the events of the book. This breakup left her with very little money and virtually no social life, and she coped with these circumstances by totally dedicating herself to work for four years (until the year she started riding the buses with Beth). At the end of the book, Rachel finds the confidence to reconnect with Sam, and they eventually get married. This outcome shows how her time with Beth has taught her to love more courageously and authentically.