Monogamy is a pair bonding strategy as old as humans. It developed at roughly the same time as polyamorous strategies. There’s a strong body of evidence that it became a very prominent strategy around 10-20k years ago, especially in areas with resource strains.
If you want to have multiple partners, by all means, do so, but don’t pretend it’s some construct. It’s a sexual selection strategy hardwired into many different species, including humans.
It just happens to coexist with polyamorous strategies in our species.
It’s no more conditioned by society than polyamory. Animals exhibit both strategies. You seem to be conflating institutions like marriage with sexual selection.