Real jealousy always increases the feeling of love. Jealousy, and therefore love, are increased when one suspects his beloved. He whom the thought of love vexes eats and sleeps very little. Every act of a lover ends in the thought of his beloved. A true lover considers nothing good except what he thinks will please his beloved.
Love can deny nothing to love.
A lover can never have enought of the solaces of his beloved. A man who is vexed by too much passion usually does not love. A true lover is constantly and without intermission possessed by the thought of his beloved. Nothing forbids one woman being loved by two men or one man by two women. From The Art of Courtly Love , trans.