Love is the only way to grasp another human being in the innermost core of his personality. No one can become fully aware of the very essence of another human being unless he loves him. By his love he is enabled to see the essential traits and features in the beloved person; and even more, he sees that which is potential in him, which is not yet actualized but yet ought to be actualized. Furthermore, by his love, the loving person enables the beloved person to actualize these potentialities. By making him aware of what he can be and of what he should become, he makes these potentialities come true.
Detachment is being apathetic or aloof to other people, while un-attachment is acknowledging and honoring other people, while choosing not to let them influence your emotional well being. Detached would mean I do not care, while un-attached means I care, although I am not going to alter my emotional state due to your emotions, words, or actions.