Why do women do this?

Talked to this girl for a little over a month. We talked on the phone once on a Tuesday. Things were great, and we hit it off good. The next Wednesday she asked if we could talk on the phone again. She was only able to call late, so we stayed up late talking the night before. I was beat due to my job needing me to be up at four. The next day talking was going well. She said she didn't sleep well the night before and that she had a lot on her mind. That night, she initiated sexting. I thought no harm could come of it, so I obliged. After that, she was very weird. We had one more good day of talking on Mother's Day. After that, she started leading me on acting interested but kinda not. Finally, I had a straightforward convo with her. She said she didn't want to get attached too quickly because it leads to her obsessing and that leads to bad mental spaces. Then she asked me about my ex. Like how I broke up with her and her reaction. Then she was weird again. 5 she wanted to call sometime and get to know me more. Then canceled. Just why? Lol.
Why do women do this?
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