Please read ALL of this
Did you forget who you’re talking about?
This is the boy who rescued his best friend from his abusive relatives.
This is the boy who confronted his biggest fear, knowing full well what he was getting in, to find answers about the mysterious attacker who had Petrified his best friend and crush.
This is the boy who stood on a broken leg and stared down a (presumed) mass murderer before physically fighting him off - still with a broken leg.
This is the boy who rushed into a secret government facility, managed to hold off three trained assassins who can kill you with two words, and was scarred for life by one of the experiments contained in this secret facility.
This is the boy whose sister almost died when she was eleven, the boy whose father was almost killed by a venomous snake, the boy who saw his elder brother get mauled and disfigured by a werewolf, the boy who had to kill in self-defence during an aerial chase in which another one of his brothers lost an ear.
“Not prepared for the real world” my left buttock.
Let’s see what he really wasn’t prepared for, shall we?
Namely, getting a chunk of his arm torn apart as Hermione fails to Side-Along him properly?
[Harry] met Hermione, also on her hands and knees, at Ron’s head. The moment his eyes fell upon Ron, all other concerns fled Harry’s mind, for blood-drenched the whole of Ron’s left side and his face stood out, greyish-white, against the leaf-strewn earth. The Polyjuice Potion was wearing off now: Ron was halfway between Cattermole and himself in appearance, his hair turning redder and redder as his face drained of the little colour it had left.
“What’s happened to him?”
“Splinched”, said Hermione her fingers already busy at Ron’s sleeve, where the blood was wettest and darkest.
Harry watched, horrified, as she tore open Ron’s shirt. He had always thought of Splinching as something comical, but this… His insides crawled unpleasantly as Hermione laid bare Ron’s upper arm, where a great chunk of flesh was missing, scooped cleanly away as though by a knife.
I’ve already screamed myself hoarse about how Ron is dangerously close to dying from a hypovolemic shock here so I guess I’ll press onward.
On top of the massive blood loss, he also is given only two days to recuperate, afterwards, he’s up and about and has his arm in a sling…He should be on bed rest, in a hospital, eating meat nearly raw to replenish the blood he has lost!! (As an interesting aside, an aunt of mine had had severe meningitis when she was 12, which led her to be severely anaemic afterwards. Know what she had to drink in order to get better? Horse blood.And it worked!)
So, Ron is basically already at a huge physical disadvantage. His increased hunger, fatigue and irritability are common symptoms of anaemia.
Now, add to this the Dark Lord, who is a master manipulator on top of being a formidable Legilimens, looking into Ron’s psyche as he is at his most vulnerable, sick and worried, and increasingly frustrated with the lack of progress of the entire mission.
Add the Dark Lord whispering to Ron, as he wears the Locket around his neck and it pulls him under, deeper in his darkest thoughts and fears.
Why are you still here, what are you even for, why do you even exist, don’t you know you are useless, they would be so much better off without you, you’re only dragging them down, that’s the only thing you’re good at, being a nuisance…Useless, weak, coward, idiot, pathetic, you pine after her but you know deep down she’d never want you, and still you trail after her like a lost child; you’re just tagging along, pretending you’re accomplishing something. But you know it’s hopeless, don’t you?You’re nothing. You have no purpose. You have no utility. You are a letdown to everyone; to your mother, to your siblings, to your best friend, to the girl you love… You’re a failure, that’s all you are and all you ever shall be…
But you know what?
Ron… he already thought all of this.
Ron already had all those thoughts inside his head. And he coped with them, daily.
He was more aggressive and a prat than usual, but he coped.
Because he was used to those thoughts, he had had them every day, every week, every month, every year he’s been friends with Harry.
He was used to it, and he could take it.
The thing that broke him, it wasn’t the Horcrux.
It was Harry.
Specifically, Harry telling him -
“So why are you still here?” Harry asked Ron.
“Search me,” said Ron.
“Go home then,” said Harry.
[…]
“Then GO!” roared Harry. “Go back to them, pretend you’ve got over your spattergroit and Mummy’ll be able to feed you up and—”
When his friend - the same friend he was being tortured about - literally told him to leave, mocked his caring about his own family, dismissed his very legitimate fears about his family being murdered, and acted as if Ron hadn’t made sacrifices to be there - he snapped. He finally snapped. It took something that bad to make Ron leave - BEING TOLD TO LEAVE. Having his worst fears confirmed. That Harry and Hermione did not want him there.
But sure, Ron was just immature and a whining brat, it’s not like his entire family was hanging in the balance and he couldn’t conveniently ship them off to another continent.
Really, Harry was kind of a prat to Hermione and Ron, and Hermione couldn't worry for family because she had indeed sent them to Australia where they were still Muggles and out of the mix. She might've been stressed and probably exhausted, but she was nice to Ron and worried for him, cared for him and almost basically lived for him.
Harry, on the other hand, was flooded in stress and still failed to see what Ron was feeling and just dismissed him - it's like Ron was going to be the first to go if Harry decided they needed to die. Harry doesn't really deserve Ron for a friend, considering his family's financial trouble, I don't remember Harry helping them, I only remember him hiding it from them. Harry is a very large prat and I daresay he was nearly one of the bad guys at some points.