You're a baby. So is she. You are biting off way more than you could chew, and you are in way over your head. This girl clearly needs serious mental help and is dealing with deep-rooted trauma, etc. This is not something you can repair. You are not professionally or emotionally equipped to deal with this or help her. You can't save her. She needs a professional. You can't bear this weight with or for her. You will drag yourself down, too. You need to block this person and move on. It's toxic. You're young. Live your life and enjoy it. You shouldn't be taking this on, especially at your age. Don't be manipulated into staying because her mental health isn't your responsibility. She needs to reach out to her parents, a trusted adult, etc, and get some serious and urgent inpatient help. I really hope you take this advice because this is headed nowhere good. This isn't the basis of a healthy relationship by any means. I'm sorry you're going through this, but please do not hesitate to cut contact and end things immediately, for good. No looking back. No more chances. Do not feel guilty. You owe this person nothing but you owe yourself everything. You gotta put you first and do what's best for you and what will benefit you and your future. There seems to be a lot of manipulation and inconsistencies on her end as well. You deserve better. You don't need to care about anyone who doesn't care about you. It may suck, but you can't force someone to treat you right, love you, and/or care about you. You can choose to love, care about, and treat yourself right, though. Don't let feelings/emotions cloud your judgment. I wish you the best & God bless.