How do people interact?

If you observe any human relationship, you will find its roots in need. Humans choose to relate to each other in hopes of fullfilling need and fantasies. If you continue to observe human relationships, you will find a pattern of hope (and energy to continue based from that hope) and then sadness / loss / despair when then need is not fulfilled to our satisfaction. This process permeates most of human activity and is masked deeply under denial in most humans.