Don't waste your time, girls - some romances are not meant to be, writes Caroline Overington. Is there a woman alive who hasn't sat on the couch, sobbing and saying: "Why doesn't he call?" Well, now we know: he's just not that into you. Sounds simple, no? Yet a guide for women that explains this basic concept has taken the book world by storm. The book, He's Just Not That Into You: The No-Excuses Truth to Understanding Guys, has reached the top of the bestseller lists in The New York Times, USA Today and The Wall Street Journal. It was...