<human>: I've been together with my girlfriend for nearly two months and she has an extremely, extremely dark past. She used to cut and admits she is depressed and believes that she has no worth to the world or anything. I brought her out of a dark place and she's admitted to me word for word when she was going through a really bad day that if I decided I didn't want to be with her, she would break down and not care about putting herself back together.

I pretty much can be certain that if I don't do this right, she will either start cutting again or take the nuclear option and kill herself. She doesn't have a good friend at her college (we go to different colleges 3 hours apart) that can be there for her so I'm worried that she will just ball up on the floor and do something catastrophic because I know she'll think everything was her fault and that she wasn't good enough for me.

I really care about the girl and I want to do this in a way that won't absolutely destroy her, but it has been a very one-sided affair and I can't keep putting her best interest in front of mine.

Any ideas on how I can do it? Calling her would probably result in her just breaking down wherever she is and doing something catastrophic, but we're 3 hours apart so I don't know how I'd instigate a meeting in person without arousing suspicion.

Can you give me the gist of the text in a nutshell?
<bot>: how do I break up with my depressive/self-harming girlfriend without causing her to cut/kill herself/lose all motivation to live.