I've noticed it's not just 'casual' dating - but also relationships.
Much like when the landline phone and personal automobile increased access to cheating partners..
technology / social media especially - increases access to 'better rung (like a ladder)' sex partners, relationship, social status, money, etc. - all a click / tap away, and likely coming to you via dms/pms..
I'll add that these auto-filters on cameras seem to make a lot of people, (especially girls from what I have seen, anecdotal for sure) - think they are more attractive than they really are.. which increases attention they get via insta/tik/fbk, whatever.. but also gives them false sense of where they could be in the ladder.. which leads them to discount 'average guy is good' -
ads make this worst too many times.
There is much more to add to this - but these things are noticeable in the data as well right? isn't like 80% of women only trying to attract the top 20% of men.
with tech making it easy to have 'a grass is greener here' profile to attract, it's harder to keep a relationship in general than it used to be, even if they don't run away, I think women are less happy / take it out on the average man when they don't have the kardashian/insert reality whatever here, type of life they see others 'living their best life' on reality-social.. I don't mean to say similar affects don't occur with men vs women - I'm just pointing to what I have seen a lot of.