The importance of ballroom dancing!!

In the novel Pride and Prejudice, written by Jane Austen there is an important fact that when ballroom dancing if a lady gets asked more than once by the same man, it means he likes her. As with Jane and Mr. Bingley he asked her to dance twice at the same ball. It was automaticlly assumend by Jane's four other sisters and thier mother that he liked her and was going to marry her. Was this a flaw statement or does it actually mean that they will fall in love?