Infatuation is love at first sight. It's passion without intimacy or commitment which explains why it can dissapear as suddenly as it appeared. The reality of life with another human being is very hard on Infatuation. There's nothing wrong with Infatuation as a starting point in a relationship, many relationships start that way but the relationship won't last unless it can become grounded in some Intimacy and/or Commitment. This helps to explain why our passion cools after a while - it has to in order to enable to relationship to survive.