I don't think humans are meant to be monogamous but for evolutionary purposes, it has served us well, as long as women knew their place.
As long as we took care of the hunter-gatherers and sired their offspring it worked, turned a blind eye to infidelity, violence, coercive control, and in return, you get a nice house, bills paid for, and security.
Fast forward to the 21st century where women have won the right to create their own security, marriage has become somewhat redundant. It used to be a contract between families, then religion turned it into something sanctimonious, forcing women to stay in miserable marriages, making it a women's sole purpose in life to marry and procreate.
Now don't get me wrong, when I met my ex-husband I fell madly in love, fireworks, the lot, and our marriage was great for a few years but sadly because of mental health issues on both our parts, I gave up, although our sex life had dwindled to nothing and I suspect there may have been some kind of cheating at the end and I don't blame him, I'd become a cold fish
Since my divorce, I have dated a handful of what can only be described as idiots, no idea why my standards fell, probably because I was perimenopausal and my brain wasn't working correctly for a while but each one of them was a deceitful, unreliable, dishonest twat. My problem, I saw the red flags and ignored them. Now I am back to myself I feel physically sick at the thought of getting involved with yet another man who will ultimately let me down and am genuinely LOVING the single life. Coming to the realisation I don't NEED a man has been life-changing.
Do I think all men are assholes, nope, but a large majority of them are given the chance. Do I regret leaving my marriage? if I am honest yes, because I've never met anyone I had such a connection with before or since, but now I have a different life.