Our expectations of one another have changed dramatically.
Many eras ago when it came to marriage or relationships lines were pretty much drawn as to what was expected of a man and a woman.
It was set up in most instances where men worked and took care of the outdoor maintenance of the household while women had children, cleaned, shopped, cooked, did laundry, and mailed out checks to cover the bills.
Better career opportunities and higher pay for women along with more birth control options empowered women to be more on par with men when it came to relationships. In the past some were willing to stay in unhappy marriages because divorce was much more of a financial hardship.
It's been reported in the U.S. (women) initiate 66% or 2/3rds of divorce filings. The stigma of divorce has vanished completely.
Online dating and social media has made it possible for one to expand their pool of potential mates. Instead of being confined to luck or chance meetings with individuals in your school, work, or community everyone now can research a reputable online dating site and post a profile.
People have been known to date and marry others who lived hundreds or thousands of miles away. Hobby websites like Meetup.com offer ways to meet people who share similar interest in various hobbies. The group meetings over time allow for the possibility of meeting someone "special".
Essentially for the most part anyone ending a relationship today could be seeing or interacting with someone new by this weekend if they chose to. Beyoncé had a hit song call "Irreplaceable" where she tells a guy; "I could have another you in a minute. In fact he'll be by in a minute. So don't go thinking you're irreplaceable."
The more options one has the less crap they will put up with!
There are only two ways to experience joy and peace of mind in relationships. We either get what we want or we learn to be happy with what we have. Accept them as is or move on.
Unfortunately it's also true that the more options one believes they have the more difficult it is for them to accept one as is.
They're always believing someone better is around the corner, up the street, in the next city or state or around the globe.