Long lasting love is quite different. There is a willingness to face each other's faults and feelings. There is true liking and acceptance. There is often conflict, but conflict represents an opportunity for negotiation that can lead to increased intimacy and higher reward. The feelings produced by both emotional states also differ greatly.
Infatuation is an intense emotion often based on physical or sexual attraction.
By its very intensity, it is doomed to fade. Love includes a sexual attraction but is more multi-dimensional, taking into account a variety of qualities and traits. Another good indicator is the presence of feelings of jealousy, uncertainty, and possessiveness. The intensity of infatuation produces a desire to cling to one another, leaving little room for individual growth. It is often self-focused and indulgent, with little real communication.