Because it’s very easy for someone emotionally detached to say that. A random commenter can say dump them and move on with their day. For OP that means letting go of an emotionally loaded aspect of their life and suffering through the heartbreak that comes with that for a while.

There’s a few big things to keep in mind.

1. The people coming to random strangers on the Internet for help are more likely at a last resort level in the first place. They want permission or validation to end things.
2. You only get one side of a story, which oftentimes makes things seem worse than they are. Any advice based on that is going to be more extreme. It’s difficult to impossible to figure out additional context that could change the circumstances.
3. Relationships are based on communication, it’s a bit of a red flag to be asking a lot of these questions to random strangers in the first place. The poster is also likely a toxic influence that the other person doesn’t need in their life.

Feels like I’m going against the grain of the other comments, but let me try to justify it. A lot of people are in bad relationships and are being treated poorly without realizing it. Letting someone know that something is a red flag might be the first step in them becoming aware that their partner is abusive. There’s no “mending” a narcissist.

That being said, a post will only ever give you a sliver of the whole story, which is why Internet relationship advice isn’t really reliable.

Lots of questions about relations on social media are coming up when someone is at or close to wits end. So a lot of those questions get answered with recommendation of a separation.

There is a very narrow margin of people online. Most are in bad circumstances or have poor social skills. Some of us have both.

People are selfish. When you ask the internet what to do they will tell the most selfish thing possible and say “fuck whoever it hurts you need to look after yourself”

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There are a few contributing factors:

1. Posts asking for this kind of advice always come from people who either did not do anything wrong in the interactions they are describing, or think they did not. Either way they will not offer a fair description of events, which means the readers will be primed to think they are entirely in the right and victimised for no reason by the other party, which is something that does warrant separation over reparation.
2. There is a general culture of disposability, especially in the US, around everything, not just relationships. You need only check the level of repairability of appliances over the decades to see it in practice, and the mindset extends to most things. Employees don’t work how you want them to? Fire and get new ones, phone broke? Trash it and get a new one, issues with your partner? you get the picture.
3. In your specific case, @DeathByBigSad@sh.itjust.works, you have a tendency to ask a lot of questions about your mental health and perceived shortcomings, and their relationship with your extremely sheltered, unorthodox upbringing, while also being extremely adamant not to do anything to change the relationship you have with your parents. Not to mention the stuff you routinely write in OffMyChest. Do not be surprised, when you bring these connections to the table, that people tell you to distance yourself, since you can also clearly see there is a toxic element to that relationship.