I came across this article somewhere;
The three components of the Theory of Love are:
Passion, the feeling physically aroused and attracted to someone.
Passion is what makes you feel "in love" and is the feeling most associated with love. It also rises quickly and strongly influences and biases your judgment.
Intimacy, the feeling close and connected to someone (developed through sharing and very good communications over time).
Intimacy is what makes you want to share and offer emotional and material support to each other.
Commitment, pledging to your self and each other to strengthen the feelings of love and to actively maintain the relationship.
Commitment is what makes you want to be serious, have a serious relationship and promise to be there for the other person if things get tough.