Just my opinion - FWIW and a dollar (inflation!!) will get you a cup of coffee.
Long time ago communication was via word-of-mouth or some form of written message which had to be delivered to intended reader(s).
Some messages took YEARS after writer penned their words on something to arrive at intended reader. Think of someone on a ship sending a message home. For example - it took 89 days for the fastest Clipper Ship to carry an item from New York to San Francisco.
Hard to have an affair/cheat or whatever if each others move takes weeks to communicate.
Now earthlings in developed areas of the world can instant message to anyone anywhere (with similar communications available) in less than a second.
Think of how many text-messages some cheaters have made to their paramour in a day - some examples on this board get into 100s.
Long time ago - that many instances of communication would have taken LIFEtimes.
So, yeah, now technology has enabled more cheating.
Another consideration is general sharing of information via all means of doing so. Now, we hear of "mass shooting" almost daily in many countries. But - is the human species really different? I don't think so. Look up the word "berserk" and it's historical etymology.
Humans have been cheating for a hundred thousand years and also "doing each other in" starting with tools of personal physical destruction such as clubs. (Think opening scene in 2001 Space Odyssey.)
Add in the changing levels of "me, me, me" self focused hedonistic bent of many people making headlines with the with the wonderful co-operational bent of news-something-people scrambling to fill their air time or column inches with titillating stories of moral degradation and you now have the world in which we live. Some folks consider some of the Roman and Greek activities to be their epitome of life's goals.
With modern computing power, even what is in print and picture is now subject to the fictional bent of anyone with means to afford the hardware. Pictures no longer can be trusted. Words we read can no longer be considered the writing of a human hand guided by a thinking brain.
Ya - modern technology has changed our world.
But there are still very many people who DO have integrity. Just seems harder to find such a one with which to pair.
There's no troubled marriage that can't be made worse with adultery."For a person with integrity, there is no possibility of being unhappy enough in your marriage to have an affair, but not unhappy enough to ask for divorce."