After 2 years things are still not going right

I posted on here a long while ago needing help because of my girlfriends self-harming etc but now it feels like it's got worse somehow.
After that long period of her shutting me out and refusing my help we were together one night and we just talked it all through for hours and hours because our friends wouldn't let either of us leave the room until we were done talking. After the talk things really picked up, after so long of being together she finally felt comfortable enough to be 'intimate' with me, we talked properly about our relationship and any problems, we were actually being pretty damn mature about everything. But all the time when things were 'going we'll' she'd been hiding her family things from me, her sisters were beating her up because of me, the fact she had a boyfriend but they didn't, her family except her aunt had totally shut her out, she lost half her friends because they didn't like me, she'd lost and gave up alot to be with me but it started to get too much for her, id always asked if things were okay at home but she always said it was all better. When it got too much I was the only one she could actually turn to, she freaked out and said she was going to 'do something' and then she left her house. To stop her from harming herself I said I'd come with her despite the fact my family don't like her and it was midnight, we met up and she had booked a hotel room to stay for the night to get away, naturally my family flipped out, started looking for me,after about 4 hours they found out where we were, my mother came and took me away leaving her there alone in the hotel. Since then my now ex-gf-but-still-in-love-etc has been convinced it was my choice in leaving, that I just used her and left, this caused so many issues, we still tried to put things right after that but she couldn't forget. It's now been 5 months since it happened and she avoids me completely even though she had told me shortly before blocking me out that she still loved me. I just can't get her out of my head, I've been trying to sort of try and be a better person and hope she can forgive me or trust me but she can't, I can't stop thinking about her and she's starting to make me feel like I'm this creepy stalker guy. She has 0 friends because she's "weird" or "crazy" her family is totally disfunctional and she has no self esteem. I seem to be the only one trying to be there for her except her exfriend whom I talk to about all this (she got pushed away and blocked out too) neither of us has any clue what to do and she keeps trying to 'fit-in' with the bitch girls but they just bully her, she doesn't realise that we are right there for her.
She's tried counselling, I've talked to adults at our school, I feel like I've tried everything
I know this is quite long but I'm lost, i would do anything for her I just don't know what more I can do and if I give up she'll go over the edge
Someone please help

I can only say unhelpful things, Enigmatical. I'm sorry. These are HER problems, not yours. You have been there for her as much as you could [and much more than many would have done!] You've given it all you could.

But they are her problems and she's got to step up to the plate in fixing them. It's not your responsibility and you can't support someone who doesn't want that care. Perhaps she will go over the edge. Perhaps instead she'll hit bottom and find a way to start coming back up again. In the meantime, you need to look after yourself. You might want to look into codependency and be honest with yourself as to whether any of that was involved in your relationship in the past. You do need to stop thinking about her quite so much. There's a line between being there for her if she asks, and not letting go of something that has finished. It might be that there will be a new phase of a relationship between you, but that won't be a healthy phase if you haven't both grown as people.

Talking to the adults at school is sensible, so others have an idea of what's going on for her. But that's the best you can do. I know it doesn't feel like enough. But this has to come from her.