♪ can't get enough love ♪ addicted to love truer words were never spoken. time for your "a.m. house call" this morning. they say breaking up is hard to do. how does your brain react to hearing this? things just aren't working out. let's just be friends. it is not you. it is me. not that i have ever spoken those words before. a new study looks at what is going on in our brains, breakups that can turn violent, deadly. ellen fisher led the study. she joins us. good morning to you. >> good morning. i am so fascinated by this. >> so am i. >> when you see the amount of stalking and suicide and homicide and clinical depression, i mean, this is one of the most powerful brain systems we have ever evolved. >> you found through your research -- this is extensive research. gone on longer than a decade. that a breakup affects profoundly sensitive area of the brain. what part of the brain?