Dr. Robert Sternberg at Yale University probably defines it best. When all three strongly exist in our feelings for another person, he says that we feel consummate love for that person. The short-term dimension occurs when we consciously decide that we love someone. The long-term dimension occurs when we commit to maintain that love. Interestingly, some evolve into commitment without ever consciously deciding to do so.
Intimacy means closeness, connectedness, warmth, and bondedness.
It has to do with understanding each other, accepting each other, and having open and intimate communication with each other. Passion is physical attraction, sexual desire, and other strong emotional attraction to another person. These three components of love were recognized in the time of Jesus. And Passion corresponds to eros. Well, you can know.