Why does she keep texting me?

I told this girl I was hanging out with that I liked her and I wanted to take her out on a date and she said sure. Then I asked her if she wanted to do something like 3 times (over the course of about 3 weeks) and she was always busy with something else. I can only assume she has changed her mind or doesn't want to go on a date, but she still texts me like every day to ask how it's going and what I'm up to. We talk quite a bit, but then she doesn't want to go on a real date? Should I just stop talking to this girl?
Why does she keep texting me?
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