She turned me down, but gets furious when I dont want to stay friends?

Dated a girl for a couple of months. Amazing chemistry. She said yesterday that she was not feeling it and suggested, that we should remaim friends. I told her that was not an option. She asked me why and I said. You gave me an offer that I will not accept. I will be more than happy to date you more, but I will never accept «just friends». She then called me a bad word and walked away from me. Why did she Get so mad?
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Deleted her from social media. She showed up at my door and begged for foregiveness. Talked about our relationship. Made clear that she had meant a lot to me, but I needed to think. Is she just manipulating me?
She turned me down, but gets furious when I dont want to stay friends?
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