My friend insults me and keeps copying me, and pretending to like the things I like?

She has changed so much since we first met. She always gets jealous, and I think she makes me sad by insulting me because of that. Like I got a new tattoo, and everyone loved it, and I asked her if she liked it and she was like “honestly… I like the one you erased better” (with smiling a lil bit)

Who would say that?! And she makes comments like “Oh, your teacher had a crush on you, that explains why you got an A on that class”

Then every time I would write poetry, or make something, the next day I’d find out that she is doing those things too but she never tells me! It annoys me so much and makes me really dislike her. I can’t figure her out!

The worst part is, I would do anything to not introduce her to my closest friends. But I don’t know how, since we live together now.

Help! What can I do? What’s the deal with this girl?