<human>: My best friend, "Christy", has always been a generally anxious and fragile person. It doesn't take much for her to cry or freak out. I've witnessed a large part of the hell she's been through in her adult life and I've always been willing to provide comfort, advice, or a distraction when asked. We share a lot of the same tastes and interests and on her good days we have tons of fun together.

About 2 years ago, she got out of a very abusive relationship that lasted 3 years and ended with him sexually assaulting her. She's been an emotional wreck since then, refusing any kind of psych treatment and self medicating with alcohol and unsafe sex with strangers from dating sites (~5 guys a week). Just to be clear, I'm not slutshaming her, I'm just concerned about her health and safety (she's already caught multiple and fortunately curable std's).

On top of all of that, she's become extremely attached to me. She calls me multiple times a day everyday, leaves 5+ min rambling voicemails, and texts me paragraphs about all her negative feelings.

Every time I interact with her, I feel incredibly drained. She just talks at me for hours about her anxieties, the men she's screwing this week, how much she hates her ex/body/life... etc. When I try to change the subject to something lighter, it always goes back to her. The worst part is when I try to head home or end the phone call, she desperately tries to extend our interaction, regardless of what I have going on. 

I've tried being blunt about my feelings with her. I've tried lying about how busy I am. Nothing works so now I just ignore her phone calls and texts for days at a time. But that doesn't stop her. She just pushes harder and even resorts to messaging me on social media and commenting/liking old pics.

I feel like such a tool for wanting to distance myself in her time of need, but I'm feeling suffocated. What should I do? Am I being a bad friend?

Could you distill the essence of the text into 1-3 sentences?
<bot>: I have a very needy and emotionally unstable best friend and I have no idea how to approach this situation without coming off as a dick and/or losing a friend.