These male-female friends see one another as family
In the old days, it seemed simple: Men hunted and women bore and raised kids. Then we moved out of caves, invented gender studies, and learned a thing or two about genetics. Now nothing is clear cut. While social and biological analyses of gender offend some, they have freed others to finally feel comfortable in their own skin.
Love is one of the most profound emotions known to human beings. There are many kinds of love, but most people seek its expression in a romantic relationship with a compatible partner. For some, romantic relationships are the most meaningful element of life, providing a source of deep fulfillment.
Empathy is the experience of understanding another person's condition from their perspective. You place yourself in their shoes and feel what they are feeling. Empathy is known to increase prosocial (helping) behaviors.