Simple really, men need women more than women need men. Historically men have heavily relied on the concept of marriage and the dependency their wives had on them to keep them. Women had to put up with being cheated on, abused etc and all that was expected of him was to work and bring home the bacon. Mens roles were defined and they were simple. They got to treat women like shit in the process and not lose her.
Now women can work, have their own income, their own property. Men are for all intents and purposes obsolete when it comes to relationships and the home. Women no longer have to put up with all the bullshit that comes with living with a man and that man has no power whatsoever to keep her in the relationship.
I think the internet has a lot to do with this too. There is now so much temptation for men at the click of a button- porn, Facebook and Instagram feeds with algorithms that show reams of semi clad women, dating apps, the ability to contact/message other women quickly. And most men are weak tbh, many will indulge in this type of behaviour that let's face it, women don't want in a partner.
But the internet also benefits us- we now have access to forums such as this, whereby we can essentially ask other women whether or not his behaviour is acceptable, to be validated and told no it isn't, leave the bastard. Some women put up with this type of disrespect for years, but years ago we'd have to out up and shit up in fear of our partner beating us, getting fed up with our 'nagging' and pissing off, leaving us financially destitute.
Jokes on them though isn't it. Because now we can have them removed from our properties, we can initiate divorce. And at the click of a button we can be on a dating site and within hours have a long queue of thirsty, desperate, lonely men, many of whom treated their exes just as badly. And there are millions of them with their sob stories, needing a woman for emotional labour, cooking, cleaning, washing their boxers, help raising their kids etc.
But we get to do the picking now and they hate it, and they have nobody to talk to about it because most of their make friends (if they have any) are emotionally illiterate, take the piss out of them for being upset at the loss of their woman. Meanwhile we've had our girly wine nights, got out all our emotions, griened and moved on. We've decided it's now either best to stay single because quite frankly most of them are more trouble than they're worth, or we start opening those hundreds of messages on dating apps. Meanwhile our ex is sat shoulder to shoulder with a friend at a bar, silently staring into his pint, occasionally checking his dating app messages, to which he has very few options, because he no longer has options.