The following is an excerpt from "Both Of Us: My Life With Farrah" [Crown, $26.00] in which fellow-actor and long-time beau Ryan O'Neal shares the secrets of his tumultuous romance with the "Charlie's Angels" starlet. Chapter 5, "Bad Sports," reveals a regretful rut in their relationship:Writing a book is an emotional odyssey, sometimes exhilarating, other times deflating.