I (M17) had to break up with my gf(F17), because she was too obsessed.

So we met in school and well, were like the young inexperienced lovers as you'd expect.

Six months ago I met her and since then the both of us have grown as people and have now a better understanding of what the world around is, or so I thought. While she's a great person and an amazing friend, the problem is that she doesn't study, like not at all. She wakes up early, texts me, sleeps, and then wakes up just to text me or watch shows, while we have our finals coming which will decide what uni/collage we get. All these months she told me that she'll pick up and that she'll do better but in all reality, our marks were heavily impacted by our relationship. I however found a balance and I did study well, I intentionally gave her extra time alone, so she could study well, but she ended up watching shows or listening to podcasts.

I was very much afraid that I'm ruining her future, I brought this up in a long conversation and her reasons for not studying were that she couldn't stop thinking of us, of me, and she spent days doing this. She said it herself that she's addicted and she doesn't want to get out of this. I told her that she needs a reality check, and we discussed how her grades are much worse than what I thought.
I hated doing it but, I gave her the ultimatum, it's either she studies well and I'll personally test her every so often, or that I leave, at least till our exams.

Her last words to me were "I still love you." and that, really does hit hard.

Let me give some background on what her conditions are.

Her house is essentially a big prison, she doesn't even have her own phone. Her parents are laidback and rich so she's not pressured at all but I do not want anything to do with that. Her dreams were to stand up for herself and be a strong individual, in every aspect. But slowly I saw her give up on those dreams, because she was too deep in love with me.

We've had fights, but they weren't 'fights', just arguments, which have almost broken us up in our past but we've always talked it out, we've always improved, incrementally and steadily. I do not want to lose her. I didn't want to say goodbye but I have no choice. I do not see any other option.

Yeah we're young and dumb and I'm trying to save her future, if my presence is distracting, then maybe my absence would be what gives her the motivation to get on her feet again. We've cried, laughed, smiled and lived so many things we've dreamt of but, I gave it up to save her future. Recently, she changed a bit and, in a good way, but in a bad, horrible way for her academics.

At heart, I want to be with her till I can.
Perhaps I am too young to love? I don't know. I don't know what to do either. I will study and score but, I worry for her, I really do.

I really would appreciate any advice on how to maybe help her, or help myself.

TLDR: She's obsessed and cannot study, her grades are a BIG mess and she really needs to catch-up but I'm a distraction.

And if you're here, I love you, please find yourself, then you'll find me.