Why does this girl say she’s not ready for a relationship yet flirts with me?

I’ve known her about 2 years, I’ve tried to ask her on a date on multiple occasions but she says she is not ready for a relationship or else she’d say yes but yet dated some other guys in between me asking her out, she continues to say she likes me and that she has a crush on me and we even spent an entire day on the phone just talking and flirting etc, things couples would do. But still she says she is not ready for a relationship and needs to focus on her. I usually know what this means but I don’t want to cross any boundaries. If I ask her what’s going on I don’t want to seem pushy but also refuse to step over any boundaries. What should I do? Or is there something I’m not seeing (besides the true meaning of I’m not ready for a relationship)

Why does this girl say she’s not ready for a relationship yet flirts with me?
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