She acts one way, then acts like I'm paranoid?

[Samantha]

I've been friends with this girl for about 7 months, we met due to an eating disorder, we're both in recovery and go to the same school.. When we first met, she was encouraging me to recover. I took her for granted and didn't recover, and she kicked me out of her life and bashed on me for two months before apologizing and we became really close, and I started recovering. When school started, she became distant, like she's doing now. I don't know what it was, and finally things got so tense between us that we started saying things indirectly to each other, finally she messaged me this really long message apologizing, acting like she didn't do anything, but apologized and we got close again. That lasted for about two months.. Now she's acting weird again. It happened after I told her that I started working out to tone up after the weight gain.. I'm not sure if that had anything to do with it. She's competitive and an exercise addict.. But she would act just fine when I would talk to her. She started acting like I don't exist again, and she started sub-tweeting me on Twitter again. And I found out that she was stalking my Tumblr page.. In some ways, though she acts like she has feelings for me. There have been several times where she acted like she has feelings for me, but when I'd ask her about it, she would act shady like she's doing now. She acted like I was crazy again today.. She randomly texted me, replying to a text I sent in December, saying she 'just now saw it.' She acted completely normal, and when I confronted her, she acted confused.

What do I do? This is driving me insane!

[None N]

Stop talking to her.