<human>: Could you distill the essence of the text into 1-3 sentences?

I M(28) just broke up with my girlfriend F(24) of 4 years. She moved across the country to be with me and we have lived together for 2 years. It started out great, but I've been unhappy for much of this time living together. We've tried for over a year to improve, I've gone to personal counselling for months to see what I can do. While she is great in many ways, long story short, I have become convinced that we are not right for each other. I ended it today, and no surprise that the breakup isn't going down easy. Breakups are hard, but she is also overly dependent in my opinion. Reading advice on other similar questions here seems to point to one thing; I should cut off or limit contact with her to make this quick and clean for both of us. However, I'm worried about some things she said, and I'm worried that she has no one to talk to or support her since her family is across the country and she has few friends here. First, she said something like, "without you I have nothing to live for, I might as well go kill myself". While I'm taking this seriously,  I'm not really sure how serious it is, and how I should respond to it.  Second, I figured she could at least go to her parents once the dust settles, but she told me that she can't contact them because of the disappointment and embarrassment. Her parents and I are her only support, as she currently has no job or savings.

Near the end of our breakup conversation, she said that she would leave immediately and that I would never see her again. Out of concern for her safety, I asked where she would go, to which she had no answer. Luckily, we currently have two living spaces, so we could be apart, but she told me she is not going to stay there. 

I feel horrible enough for breaking her heart, but even worse that she has little to no support. I feel like I can't completely cut her off, and I'm worried about her safety. What do I do?
<bot>: I broke up with my live-in girlfriend of 4 years but I'm worried that she has no support system and might do something destructive, so how close do I stay to her while the breakup dust settles?