A good friend is worth a million half-friends. But you look at someone and what you see is the physical and, under such conditions, it is impossible to love everyone - if this is all you see. You do not love the physical appearance but the person, who and what they are, an individual and a divine part of god. To love them realise that a person is not their physical appearance, as appearance is irrelevant. The physical body is just a vessel for the soul, though it possibly reflects insecurities.
Love is the key to everything.
Fantasising is merely the product of an insecure mind which needs a place to go where it can release from the feeling of inadequacy. In our fantasies we are allowed to become the person who everyone looks up to. However, this temporary feeling of security it provides could conceivably do more damage than good as it reinforces the feeling of inferiority in who we actually are. The exception to this would be fantasies which satisfy an entirely internal drive though most of these are sexually based, which are based upon sexual frustration. For others it is to show off a partner to friends, or at least associates.