How can I get away from all of these clingy people?

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For some reason I attract the clingiest people on earth and I feel like I can't escape. This girl back home that I used to be really close friends with has become an angry depressed alcoholic. She blacks out every time we go out and then I have to stay up all night to take care of her as she curses at me and tells me to go away. Whenever I post a picture on Facebook she texted me immediately asking me if I'm home. And I always say no I'm back my university (which I am). I really font like hanging out with her and I'm graduating in 3 weeks and moving back home so she will be texting me constantly!!!! Then I have another friend who is a male and he has been calling and texting me everyday to talk about this girl he likes. I never respond because he's not a good friend. I have no patience for him but all he does is call and text me everyday and I never answer!!!! How do I get rid of these people?!,