Robert Sternberg proposes a triangular theory of love. It is suggested that there are 3 components to love within a relationship.

(a) intimacy
feelings of closeness, connectedness, bondedness experienced in loving relationships

(b) passion
encompassing the drives that lead to romance, physical attraction, and sexual consummation

(c) commitment
encompassing, in the short term, the decision that one loves another, and in the long term, the commitment to maintain that love.

Empty Love - Commitment without Intimacy or passion
Friendship - Intimacy without passion or commitment
Infatuation - Passion without intimacy or commitment

Romantic Love - Intimacy and Passion, without Commitment
Companionate Love - Intimacy and Commitment, without Passion
Fatuous Love - Passion and commitment, without Intimacy

Consummate Love - Intimacy, Passion and Commitment

All I can say is, I found this somewhere on the net of someone's and it's so, erm. something new. HAHA.