According to research, those intense, in-love feelings are due to highly complex, pretty unromantic chemical, cognitive, and goal directed brain processes involving over 12 areas of the brain working together to produce the magic.
When they steal the covers. When they grab your hand in public. When they wrap their arms around you and squeeze you. When they make you laugh. Every moment that they make you fall in love all over again is why being in love is so unbelievably incredible.