I didn't expect so many responses to my post... I read them all, but couldn't reply to everyone. I a…

I didn't expect so many responses to my post... I read them all, but couldn't reply to everyone. I agreed with some things, disliked others, and took notes on a few. Thanks! Now, let me clarify a bit. It wasn't me who told my brother—she herself blurted it out to an acquaintance of theirs. The context and purpose remain unknown to me. Either way, I wouldn't have told him myself; that information is unnecessary for him. We talk about everything and nothing, not just her feelings and worries, naturally. Our communication isn't daily, nor even always weekly. She always calls or writes first; I never push. We can joke, discuss books, gossip about our lives and women's topics in general. I wrote as if I were a round-the-clock psychological support service. No, we've always talked about many things. After their breakup, we haven't discussed my brother once. I love him no matter what he does or how he treats her. I don't allow anyone to badmouth my family and loved ones in my presence. She's not stupid; she understood this at their very first meeting. It hurts me that he's capable of causing pain (this isn't the first girl he's left), but he's an independent individual, and I don't feel it's necessary to interfere in his life. When he asks for advice or shares something himself, I naturally express my opinion and whether I approve or disapprove. But without a request, I don't meddle; he should figure out his own life. He's a difficult boy and causes a lot of trouble for his parents, who struggle to manage him, unfortunately. So, I've always been directly involved in his life. He brings all his problems to me first. I consider it wrong to completely ignore his opinion. And if my communication with the girl causes him discomfort, I'm willing to meet halfway! However, I want to exit this situation as delicately as possible so as not to harm anyone. Because the girl matters to me too. It just happened that for these 1.5 years, she also shared all her struggles with me because her mother's involvement in her life was minimal. I clearly understand her motives; it's unfair they attributed other intentions to me. In this girl, I see myself and hundreds of others (including stories I later read on forums) who had no one to reach out to help in time, no one to give proper maternal advice. If communicating with me makes her into a confident girl who knows her worth, doesn't humiliate herself for boys around her, doesn't tolerate poor treatment "in the name of love" because "everyone does it," I'll be happy. Not every mistake needs to be learned from experience. Not every youthful experience needs to be lived through. Not everything should be tested on one's own skin. I'm not God, but if help is needed from me and I'm able to provide it, I will. What's really going on in her head, I don't know. I can't guarantee her motives. But cutting off contact with her would simply be betraying and abandoning her during a difficult moment. As for her hoping to get everything back, I don't know, but she knows my position: "categorically against." For now, I've removed her from friends as my brother requested, but I explained everything honestly to her; she understood and wasn't offended. There will still be a conversation with my brother. Currently, we communicate less frequently, but we do still talk. In my ideal world, this communication will eventually fade away on its own when the girl is finally ready for it.