I recently stumbled upon this book on relationships by Helen and Harville Hendrix, and it is excellent.
In the intro they say this book is a distillate of Getting the Love You Want and it is true. When you know the general patterns relationships follow, as they progress, you can consciously move through the difficulties and into the kind of relationship you always wanted.
What I find most exciting, and what I have experienced myself, is just how incredible it feels when you start to consciously grow with someone. It's not just that the relationship becomes very special, it's that in your own being you feel freedom and power that's beyond what one can imagine.