Greg Behrendt is the co-author of `` He 's Just Not That Into You , '' now a film . Behrendt joined a mostly female writing team on `` Sex and the City '' `` [ Women ] deserve great things , and they get to decide what their relationships are , and not other people , '' he said . `` He 's Just Not That Into You '' is a book for women who worry about relationships . The book was published in 2005 by Simon & Schuster.
Greg Behrendt is the co-author of `` He 's Just Not That Into You , '' now a film . Behrendt joined a mostly female writing team on `` Sex and the City '' `` He 's Just Not That Into You '' is a book for women who worry about relationships . The book was published in 2005 by Simon & Schuster.