Why is she pulling away if she likes me?

So lately I have been dating a girl, all of a sudden she asked me what do you think this thing between us going? I told her that I'm looking for a relationship and she answered she is looking only for a friendship for now, So I pulled away completely for a couple of months and later we started seeing each other again and had oral sex which was fantastic only to find her pulling away all of a sudden and not replying to my texts, what do you think this is?

Why is she pulling away if she likes me?
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