From the little they said we can infer that this is not the first time our magical girl has hurt one of her friends in similar way, and it looks like that girl was really hurt by whatever happened as she keeps crying in the background. Not wanting to be friends with someone who keeps hurting others is reasonable, and it’s not their responsibility to endure that just so she could feel less bad about it. Personally I would find it worse if they just started ghosting her.
There are events called "misunderstandings" between people. Not without a reason they happen to people who have less experience while interacting with people, like introverts.
It's sometimes caused because people say X but think Y, or X is just another word for Y but it sounds similar to something else and it leads to nowhere or worse. Or maybe it's caused by some previous experience or just because the person thinks of something else at the moment.
In such situations extroverts have advantage as it doesn't usually happen to them, they have more friends and immediately can pick on the other person before the introvert even realizes he said something wrong.
No, the introvert didn't mean wrong, he either misunderstood or didn't want to be cast out not knowing something you may consider common and even essential knowledge.
For the introvert it might be an all-in gamble, meanwhile the extrovert might just shrug it off and leave.
"But she hurt her" - without knowing what happened, what was said, what she thought, what she felt like and what the situation was like it, without understanding both sides it is unfair to judge and say "it's better this way". One thing to be neutral, but it's never okay to not try to understand both sides and just choose the
apparent good side. But nobody cares about the person being cast away, since that person doesn't have friends anyway.
Some people just feel like aliens among the humans.
Some people in solitude feel the least alone.
