What should I do about my friend who copies me?

Anonymous
So I started hanging out with this girl again whom I haven't been friends with in a couple years and she's already starting to copy everything I do just like she used to. It's getting really annoying even my other friends make comments saying she's like the girl in the movie Single White Female. She copies everything: my diet, how I work out, makeup, she's even slept with my current boyfriend years ago before we were dating after I told her I had a crush on him which is another huge issue entirely. Every time I see her she wants to know where I got my shirt or whatever it is I'm wearing. If I tell her I got it years ago she looks really upset by it. What should I do? Now she keeps inquiring about my boyfriend asking "Why doesn't he talk to me anymore? We used to all hang out. " She is a nice person for the most part.I just don't know if it's really worth being her friend or if I'm just blowing out of proportion.
What should I do about my friend who copies me?
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