Yopaz said:
I'm a psychologist, so yes, I know all that. But love isn't that simple, or you'd spontaneously fall in love with half the wo/men in your gym. Similarly, if love were that simple, you'd fall in love with everyone you have sex with (endorphin release in the brain nearly identical--or stronger--to release when couples reunite after a long time apart). Further, people with incompatible immune systems would never fall in love (they do), and women coming off birth control would never be able to stay with their SOs after finding out they can't stand the smell.
But the fact of the matter is, love is more than that. Love is shared memories, and sacrifice, and sharing the load, and mutual empathy, and a million other little things that have nothing directly related to biology other than "my brain is on".