I hate that it's more or less an enforced binary structure - to be single and dating, or together and exclusive. I hate that there are plenty of people who don't actively consent to monogamy, who are not happy in monogamy, but through society pressure and lack of information, unwittingly follow the prescribed norm hoping for that illusive happy ever after.
There's a rumour going around, propagated by [some] polyamorists, that polyamory is a superior ideology to monogamy. Let's face it, 'limitless love' does sound wholly honorable and blissful, even if 'limitless sex' with multiple partners sounds ~ for most of our sex-negative society ~ quite the opposite.
Monogamy, once the structure and safehold of my rule-based life now resembles the unhappy wasteland of Auschwitz. It is a place I once lived in, starved of freedom, healthy love and emotional growth. I clung to it as an better known devil and whilst I accept monogamy as a choice of my friends, I don't find it rational or sane
It's a fact. Whilst most humans might have an inclination to 'pair bond' many of us also have a roving eye. At a biological level our most successful survival tactic is not - as the church might tell you - remain faithful and worship a deity in the hope of salvation, it is to breed with many partners.
Whilst I may be in an open relationship, I am not some enlightened being immune from jealousy. I am not above jealousy. Because I, like the rest of the planet, used jealousy to get what I wanted and needed as a child. Jealousy is a highly successful tactic the mind has for seeking security outside ourselves.
In trying to fit their round polyamorous selves into a monogamous square hole, they will ultimately fail and repeat a pattern of guilt and self loathing which contributes further to lower their self esteem. Their obvious failures and misery are compounded by the disgust of their peers, parents and often even their friends.