The greatest and cheapest antidepressant is the endorphin’s and positive feelings generated by being around the one you love. And the biggest plunge happens when that is taken away from you by your partner’s duplicity. We humans are more governed by our dopamine systems that we ever know. And it is that very dopamine system that keeps us attached to old and unobtainable loves years after the initial loss. It’s called nostalgia-that longing and wistfulness for a simpler time when we felt safe.