<human>: I've been dating this girl for half a year now, and things aren't going so well. We don't see eye to eye on a lot of things, and she takes a lot of offense to me casually talking to other female friends.

I think that I want to end things, as we've tried to talk about these kinds of things, and I've made an effort to be more tolerant and conscientious, but things still aren't changing, and I'm still not happy. The thing is, she's known to really freak out when she's upset or scared about things, and over the course of our relationship she constantly tells me that she has no idea what she would do without me, and that I'm the only happiness she has in her life.

On top of that, she also has a history of cutting herself, as well as smoking excess amounts of marijuana whenever she gets really emotional.

What do I do? I don't want her to hurt herself or for anything potentially worse to happen to her... but I can't happily be in this relationship either!

Could you distill the essence of the text into 1-3 sentences?
<bot>: I'm afraid that my very-emotional girlfriend will physically harm herself when I break up with her. What do I do?