Too many butterflies in your stomach? Your heart knocking out your ribs when you think of or see that very person? Modern studies and research in neuroscience have shown that when you are in love, your brain releases certain chemicals, hormones and the neurotransmitters stimulate the "pleasure center" of your brain. Those inexplicable strange sensations are the side effects of it. Inability to sleep, loss of appetite are other effects. So now you know, it also takes a thinking brain and your mind to know you are in love with someone. The heart feels all the heavy sensations because it pumps blood and beats faster than usual because of the brain's chemical releases.
Image Source: www.scientopia.org
In the long history and origination of love is has become a necessary vulnerability. Karen Horney, a psychologist say that love is overestimated. In terms of "monogamous ideal", it leads to disillusionment. It makes your partner want to escape. The possessiveness causes a friction and results in unhappiness and alienation. This leads people to find love outside marriage. Thus, love broadly is the ultimate motivator of interpersonal relationships. Though darker in many ways it is central to our survival and our lives.
Image Source: www.pinimg.com