I'm not in love with my GF anymore.

[prime beacon]

her saying shes going to killherslf if you leave is emontional manipulation, she wont actually do it

if you stay its just going to get worse

[small geyser]

i agree with the comment above. it sounds like emotional blackmail and thats one thing you shouldn't give in to

[earnest cloak]

She's tried killing herself before, and she's got scars all over her arm from self-harm.

She's been at a really tough spot.

[small geyser]

its easy for me to say but you should walk away. she is guilt tripping you into staying with her. you’re not in a position to help her with these things. you are not a doctor, you are not a trained counselor or therapist. i understand that you want to help her but it’s not right

have you tried telling her parents about it ?

[earnest cloak]

No, she made me promise.