The idea that "intense" affection is a pre-requisite for marriage has caused the institution of marriage itself to decline in the West
Marriage ought to be seen as an essential "rite of passage" - not a luxury good
unherd.com/2020/02/why-ar…
Even the most un-social, unskilled, unintelligent among us
Only arranged marriages ensure that
In a "love marriage" set up you see enclaves of excellence as an outcome of assortative mating
And a LOT of Incels
Men are brutes by nature. They need marriage to civilize them
Lifelong Monogamy has become an ideal achieved by high EQ men - that's a shame
It ought to be an ideal for all
It creates enclaves of similar tastes, similar IQ, similar habits
Where positive traits get reinforced endlessly and so do negative traits
But it likely picked up with the Protestant reformation and the rise of divorce - Henry VIII an early example
Christianity had stalled it. But post 15th cen it appears to have returned along with "love" what with the reformation and also the cultural revolutions that accompanied it (Shakespeare's plays being a case in point)
A heady combo
Though polygamy was common among the rich, there were ideals of monogamy from v early in our history
Shri Ramachandra a stellar case
Rather positioned love / devotion as something that builds within a marriage