Tell someone. Obviously, parents don't seem like a great option here, maybe a school counselor or a teacher or something like that. Do this first and foremost, and for the situation, ask them to keep your name out. Try to talk to your friend. If the ties are severed and you don't think there is any chance of being friends, then don't ask to be. You don't have to be friends for you to offer your help. And that's all you can do, just offer to help them, and try to express more empathy and concern than desperation for friendship. Your main concern is helping your friend, correct? Then let them know that even if they treat you like **** and/or don't like you, that you'll still be there to help. Don't stoop to the level of arguing, if they tell you they don't want your help, they could be lying or just don't want to talk. Pushing farther will only make things worse, just letting them know you're still there will be enough for them to ask for help when they feel they need it. Just be respectful, even if they are not. If they choose not to want your help, that is fine. You tried to help them, you did what you could. That's all you can do. Sometimes people can be afraid to leave a situation after they've been there for so long, even if they know it hurts them. You can't help someone who doesn't want to help themself, you have to wait until they want help. If they don't, you're not useless, because you try to help them and you still care about them even when they are mean to you, and that level of care is something I've seen a lot of people lack. Never think you are useless, you're a wonderful human being, and keep that about you.