The near enemy of love is attachment. Attachment masquerades as love. It says, I will love this person because I need them. Or, I'll love you if you'll love me back. I'll love you, but only if you will be the way I want. This isn't love at all - it is attachment - and attachment is rigid, it is very different from love.
Seeking the Heart of Wisdom: The Path of Insight Meditation (ed. Shambhala Publications, 2001) - ISBN: 9780834825253