Why did the girl I’m talking to start acting this way?

I really desperately need answers to this. I like this girl so I’m going to keep this short and simple, my brain is fried trying to figure this out. This girl I’m talking to that has claimed to of had a crush on me and even said she missed me when I had disappeared from all social media’s suddenly, I came back and we started talking again and she even seemed elated to talk to me. We would call, talk and flirt, compliment each other and even sometimes get sexual. Things were seemingly mutual. She said she was tired of being single at one point but then i told her that I want something with her in the long run, then it switched to “I’m not ready for a relationship” and that I don’t have to wait for her, when i compliment her she doesn’t return it, when I say I’d like to see her she goes around it, she knew I liked her before and when I say I like her now she doesn’t say much to it. She is short with her messages but she kinda was before, she offered to call recently, she’s sent me pictures of her recently and still says good morning but something just doesn’t seem right. I need any answers and advice I can get…I really like this woman and want something with her…please help, thank you

Why did the girl I’m talking to start acting this way?
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