Unrequited love refers to those feelings of love that are not reciprocated.Interpersonal love is most closely associated with interpersonal relationships.Modern authors have distinguished further varieties of love: infatuated love, self-love, and courtly love.Non-Western traditions have also distinguished variants or symbioses of these states.Most commonly, love refers to a feeling of strong attraction and personal attachment.
Some historians date modern conceptions of romantic love to courtly Europe during or after the Middle Ages, although the prior existence of romantic attachments is attested by ancient love poetry.
Interpersonal love refers to love between human beings.
It is a much more potent sentiment than a simple liking for a person.
Love as a general expression of positive sentiment (a stronger form of like) is commonly contrasted with hate (or neutral apathy); as a less sexual and more emotionally intimate form of romantic attachment, love is commonly contrasted with lust; and as an interpersonal relationship with romantic overtones, love is sometimes contrasted with friendship, although the word love is often applied to close friendships.
(Further possible ambiguities come with usages "girlfriend", "boyfriend", "just good friends").
Abstractly discussed love usually refers to an experience one person feels for another.