No, it wasnt always that way in "the west". While it of course happened, women had to avoid the coming out of her infidelity.
She was called out for being a slut by society (family/neighborhood/work) and she had to pay a price for cheating.
This just changed a couple of decades ago, when women got more and more access to dyck and attention through social media and were more and more empowered and financed by the government.
Today, there is hardly any repercussion to a woman cheating. Not socially and not financially.
Wake up man, you live in the world where female prison guard fck inmates, where female lawyers fck inmates, where inmates are adored by females (anyone here aware of Wade Wilson story? Guy killed 2 women and still received letters from over 4000 female fans - in addition to over 146 indecent photos from women ready to jump on sociopath's pole), in the world where females are BORED with normies, BORED with sharing financial weights of mortgages everyday together with their husbands, BORED of hundreds of thousands of average, normal guys struggling with everything, asking AI engines about every little sh*t, asking their buddies about everything that worries them (and they are worried about a lot average guys worried about), guys going to therapy more often than women do and crying over Bogart in Casablanca like pansies.
Women however love push-pull, love a good fight, love to be ordered around or treated badly by bad boys (or treated badly because why not?). Hell, I have personally experienced it how easily is to go to bed with other guys woman. They sense this "he is about himself, about career, he is a sure of himself type". They love it. Once you understand that female has this animalistic spirit which is a bit different from yours, but complementing yours above social norms of "normies", you go past border of rationality and towards true knowledge about human character, which is partially as close to animals instinct as they can be. Bad boys are closer to such insticts. Just because a female seems to be faithful does not mean she always was. Objective truth remains almost always undisclosed and its brutal.
If you think that bossy woman ordering her boyfriend around would be bossy with any guy, you are wrong. All these girls like to bend over like cats and allow do crazy things to them if the right man is ready to lead them in bed or in life - and no marriage, no "conservative upbringing", no "people are going to gossip" will stop woman from spreading her legs, if THE man will want her and take her for himself. Her c.uck-boy can sit nicely and watch how it is done if he really wants to be around her all the time. If someone thinks that female character has changed in 60 years or something, he does not understood what has truly happened.
Soy-boyz happened. Weak-boyz happened. Cry-boyz happened. Being man is partially about being territorial animal and dominance - not about "peaceful, tame co-existance". Men got tamed quickly in the past 100 years and females CRAVE what was lost in the process - your violent nature, your disregard for danger your grand-grandfather probably had to show here and there to get a shot at your grand-grandmother. Struggle for a girl (fighting for a girl, etc.). Women are taught just as we are that being civilised is being good - but we are not robots.
Most of males living before us had much less to loose 100 years ago and much more to gain from taking risks, so they fought harder for what they truly wanted - and guess what, females were more conservative and were interested in maintaining laws because laws protected them - otherwise they were in territory of constant struggle and possible violence in which men lived.
Now you have a lot of guys trying to impress women with money or status & money - and that's it. That's boring. Guy has a fast bike? WOW, WHAT A DAREDEVIL. LOL. - but man going after married woman (or taken woman) because HE wants HER THAT BADLY to DISREGARD social norms around him, to take the risk, to create stress, to create fantasies, to create story from romance book. Man. If he is - in addition - good looking, educated and with money - well, I would bet a lot that a lot (A LOT) of women perceived as poster girls of morality would fall quickly to advances of such a guy. If criminals get their way with educated female lawyers, you think a proper DJ won't screw your girl if you are an average guy? Cold logic would be against believing it. A lot of guys here would say "he would never screw my woman"
Well. Perhaps - if you are strong male. If you are a wuss, your girl would spread her legs without second thoughts and you would not even know. You would even receive the best dinner of your life on sunday from her (to satisfy her conscience) and on monday she would again think about the guy that crossed the line of social norms for her because that's what make women wet down below.
When woman see 5 guys speaking about financial investments, crypto, real estates investments - she is around because her mother or cunning best friend taught her to be around the milk cows.
When woman still able to ovulate sees a real man on the prowl (whether in business, social situations or in romance) doing real man/bad boy stuff , she is truly interested, even if she says she is not.