During the pandemic, I was fired from my part-time job and I found another job in a shitty company who gave me the impression and the gut feeling that it's horrible and I should probably call it quits. I went over the careers subreddit and I asked people how their jobs that had a bad impression in the beginning for this reason or the other turned out to be in the long run and if it got any better. The striking majority which was shocking to me said that their gut feeling was right, the job didn't get any better, and they ended up being absolutely miserable in a 9-5 job they loathed with all the passion in the world. Right there and then, I decided I'd starve under a bridge than continue working for a shit company with shit pay. I was still a student and had a monthly stipend anyway, so I just quit soon thereafter.

This sub and many other places on the internet, even many psychological research proves that gut feeling is usually right, and while, just like the stock market, the probability of it holding some truth to it is high but could ultimately be wrong, the majority of the times you had a gut feeling about a girl or about something, I usually unfortunately for you the case, but why gut feelings are so important?
Enter behaviour patterns.

Behaviour patterns are patterns that deeply interwoven with your psyche, your background, your culture, your life experience, your family and upbringing....etc and the list of things that form these patterns are truly endless. They can be as simple as habits that you do everyday on the regular, or they can be some deeper traumatic past experiences that shape the way you view certain things. These patterns define who you are, these patterns are, in fact, in some way, you.
The patterns, as the name suggests, come with milestones, they come with signs and clues that they're happening, and once you pick up on those signs, you'll be able to recognise them and these signs when they do happen, they end up triggering the pattern itself.

Let's say that you had a terrible experience with dogs during your childhood. Unfortunately for you, they weren't the domestic lovely cute little pets that people claim them to be. They were ferocious and they attacked you multiple times and you developed a deep fear of them, and then during your adulthood, this turned out to be a phobia, so one day you're walking down the street with your mates and you see a dog and get a panic attack. Your mates are confused and are saying they're just dogs chill the fuck out, but unfortunately your patterns are already kicked in and are in motion, so late in their stages that you can't help but just feel fucking terrified of a chihuahua.
That's a very simplistic example of behaviour patterns, but they all, more or less, with a varying degree, follow the same module.

These patterns are almost impossible to change unless you go an equally traumatic or profound experience that makes you reconsider them, either see them for what they are and disregard them altogether, or slowly but surely work on them and become s better overall individual. And this is why it is not your responsibility to recognise terrible behavioural patterns in other people and try to change them. You just can't. It's who they are, it's always who they will always be, and the question that really remains: are you willing to put up with these patterns or are you just going to leave and let them handle their shit?

This applies to romantic relationships in dating, as well as friendships and even familial bonds. Here's an example.

I matched with a girl on Tinder whom I really liked and we texted heavily towards the end of last year. I had to fly home and I told, explicitly, that I won't be available for the next few days because I'll be home with family, and we'll talk when I'm back. We continued texting until I eventually flew back, and as we're texting, she dropped the first clue that she'd a miserable wannabe hopeless romantic who just wants everyone else around her to feel as miserable if not more.

She said she was excited about showing me somewhere that she really liked and she took off talking why that location is great, I cracked a joke telling her if she's gonna kidnap me or something. She went ahead and said, "Why would I do that, you're not worth it lol".

A shit test? Maybe. But to me that's just disrespect. How do you tell someone, jokingly or not, they're not worth it, that's a direct blow to their self-esteem, and people with self-image issues or whatever, could really not take it lightly. I would've ended it then and there because that's all what I needed, but after discussing it with my sister, she was convinced this girl was only fucking around and nothing serious. So as a challenge, I thought okay I'll continue like nothing happened and let's see what she does next.

And as it turns out, my gut feeling was right. She just kept getting more and more pitiful, and at some point she even unfollowed me from social media but kept texting like nothing happens. When I asked why she unfollowed me, she said because I ignored her, but I had informed her that I'll be home with family and not have the time to text, she then said lol it's okay you don't have to justify anything to me, we're strangers.

So I blocked her and sent the screenshot to my sister. The girl then found me on another social media platform and said what happened and she thought I was amazing: biggest and worst behavioural pattern to date. Not only is fucking miserable and tries her best to drag you down, but when you think of leaving, she clings up to you and keep you around to get even more miserable. That's what kind of girlfriend she'd be. She'd insult you to your face, lace your shit and mop the floor with you then give you the sweetest fuck and a blowjob ever, am I exaggerating? Maybe. Am I wrong? No.

Best predictor of behaviour is past behaviour. You're not about to offer any type of profound experience to anyone. If someone is acting in a red flaggish way, it's part of a bigger pattern in the background you're not in charge of and it's best to just fuck off and let them do their dirty laundry.
I could go on and on about this, but I think y'all get the gist of it.