This is just an observation. YMMV, of course. But I've noticed this with increasing frequency in recent years...
It's not necessarily a "new" thing. Lying certainly isn't new. But I imagine there must have been a time when, hypothetically, you could make plans with someone, or discuss something, and they would damn well hold to it/keep their word...
Like, in my observation, this happens all the damn time: people flake, people change their mind at the last minute, people ghost (and I do it, too), people, worst of all, change plans, or change their mind, and don't even tell you...
I'm not talking just with women, either. My male "friends" do this. My family does this. Constantly. Randoms I meet, and plan to meet up with later, do this too. And sure, I'm a common factor, but I see this happening more generally, to all manner of people I know, too.
I really, really wish that we "as a society" hadn't normalised this... "Flaky", noncommittal, "my needs come first, always" bullshit...
I really, really do.
If there's a culture where keeping your word and actually committing is still the default, I look forward to one day finding it. Because I am yet to really... Ever experience that. And I've travelled fairly widely and met a lot of people.
Despite what schools teach nowadays, the US was founded on Christianity, and English society likewise was grounded on the Bible for hundreds of years. One core tenant was the teaching of Jesus, "let your yes be yes and your no be no," and this reflected throughout society.
Now, even the average church-goer isn't really God fearing in how they live their life, and the unchurched certainly aren't. Instead of "love your neighbor as yourself," self love is taught, to put one's emotions and desires above all else.
As a result, society has become filled with self centered liars and flakes, who make every decision first and foremost based on their own desires.