I'm going to recommend a book which is not about self-help or self-growth or relationships and is, therefore, all about self-help, self-growth, and relationships: Getting Past No: Negotiating in Difficult Situations, by William Ury (NY: Bantam Books, 1993, ISBN 978-0-553-37131-4).
I was looking for this book and the bookstore didn't have it in stock, however, I did pick up The Power Of A Positive No, by William Ury (NY: Bantam Books, 2007, ISBN 978-0-553-38426-0) which I just started reading today.
Me-44 WAW-42 (ILYBNILWY) S-16 S-14 M-10/17/1992 T23 Met OM 10/10/08; Bomb 12/27/08; Moved in with OM 01/27/09 Me stronger and happier everyday!