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love relationships romantic love first love breakups heartbreak infatuation stages of love stages of relationships passionate love ventral tegmental area VTA brain neuroscience neuroscience of love neurotransmitters dopamine prefrontal cortex attachment compassionate love oxytocin vasopressin hormones pair bonding hormones insular cortex rejection emotions education animation Biljana Labovic Shannon Odell TED TED-Ed TED Ed Teded Ted Education