FACT: There is electro-chemical reactions that create the emotional feelings that man has labeled "love". Because this is something that most people will only see presented on the likes of The Discovery Channel and the like, and given that this has only been discovered in the latter half of the last century, man convinces himself of things such as "meant to be", "the love of my life" and such. A "spiratual love" is much different, and is hard to define or actually "put your finger on it". Our love for God(if one believes that) is spiratual, obviously, because there is no actual entity similar to a person who can illicit the same types of responses as in "scientific love". Every individual will see "spiratual love" differently, while some may not even believe in it.
FACT: Somebody in a lab has mapped a brainwave pattern to be common among people who are claiming to be "in love."
Additional FACT: That brainwave pattern has nothing to do with why I am still married to my wife after 20 years, and more in love than I was 20 years ago.
Additional FACT: People knew what love was long before any squiggles ever appeared on a scope that monitored brainwaves. The brainwave monitor doesn't create the love, nor do the waves.
Both may be evidence of an emotion, but neither is the cause.
But you need to open the eyes of your spirit to know this. If you trap yourself in your materialist box you will never know it. Blind men can't know color. Deaf men can't know sound. The spritually dead can't know love.
But they can amuse themselves by reading brainwave monitors and claiming they know FACTs.
Shlaom.