According to and article titled Courting the Victorian Women, "Courtship was considered more a career move than a romantic interlude for young men, as all of a woman's property reverted to him upon marriage". Mr. Bingley traveling is discussed as everyone's business, and "reports" are updated of his whereabouts. It's not that the town where the Bennet's live is gossipy, but rather so many young women are hoping to marry Mr. Bingley and wait for the opportunity to run into him conveniently, or can know how many times he has gone to see Jane Bennet etc.