Is my best friend really a friend at all? Should I move to her town?

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I have a friend who I have known for many years. She lives about 35 miles from me in another bordering state. I am currently going through financial problems and need to find somewhere cheaper to live. She has been asking me to move to her town where it is cheaper. She also wants me there to be near her. I don't know if I should or not. I'm not just moving there for her, but she is a big part of it. She calls me her best friend, but in actually we are not. She is totally unreliable as a friend. I don't trust her because of how she has treated me over the years. We don't see each other a lot because of distance. We made a deal to take turns driving to visit each other. I have been coming to visit her, but she makes up excuses so she doesn't come and see me, but she will drive 40 miles away to see her boyfriend. Mind you this is the boyfriend who she cheated on, but he doesn't know it. She bends over backwards for everyone else, but when it comes down to me she won't do it. I asked her why she will drive for the boyfriend, but not for me and she said because "thats my boyfriend". She also uses people and lies. She constantly asks me to move up there, but why should I? She sucks as a friend and makes it seems like she cares for me a lot, but she doesn't act like it. I feel like a second class citizen. Like I'm not good enough and only wants to be my friend when it is convenient for her. Everyone loves her and thinks she is great, but I know otherwise. She puts on a front, that her parents don't even know how she is. She wants me to move, but I don't want to move to a town with a friend that is no good. My family has told me to leave her alone, but I don't have a lot of friends. She has diabetes and I want to be with her so I can there for her, but she uses her health problems as a ploy to get people to feel sorry for her. I don't know what to do. Should I move up there, but not rely upon her friendship? or should I move somewhere else? All I here from here is "we are best friends". That is not how best friends treat each other.