Why does a woman who shows interest first and then cuts off do this?

There is a woman at work who is single but older than me, I felt that she was interested in me, I thought that she liked me, she was smiling when she saw me, she said good morning, she seemed to be happy that I was in that environment. I was standing in the background so as not to get a reaction from her so that she wouldn't say what the hell.

When he wanted something from me about work, at first she was making phone calls, not her cell phone, but the phone of the workplace, but then he started texting. Little by little, I mentioned his private life and that's how I learned that she is single.

Last time I asked a question about personality, the answer was "don't text me about private life anymore and don't ask me questions!" Wrote. She started the message business and then banned it. Since then, there has been no message, she calls again and asks for something. I didn't hear the phone because I was out a couple of times, he sent a message again, and when I saw it, I took what she wanted. First show interest, hint that you like it, but then take a step back, what kind of business is that?

I always kept it in the friendship dimension, I didn't go any further.

Why does a woman who shows interest first and then cuts off do this?
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