Human love makes its appearance in the matrix of ego-consciousness, which has countless desires. Love is colored by these factors in many ways. And just as there are infinite shades of color in different flowers, there are diverse, delicate differences in human love.
Human love is encircled by a number of obstructive factors, such as infatuation, lust, greed, anger, and jealousy. Infatuation, lust, and greed might be looked upon as perverted and lower forms of love.
In infatuation a person is enamored of a sensual object; in lust he develops a craving for sensations in relation to it; and in greed he desires to possess it. Of these three forms of lower love, greed has a tendency to extend from the original object to the means of obtaining it. Thus a person becomes greedy for money or power or fame, which can be instruments for possessing the different objects that are craved.
Anger and jealousy come into existence when these lower forms of love are thwarted or threatened to be thwarted.
-Discourses 7th Ed., p112