She has a boyfriend, but texts me 24/7. Why?

I've met with a girl not long ago, but ever since we're texting each other almost all the time every day, up from the moment she wakes up, to the moment one of us goes to sleep. The strangest thing is, she has a boyfriend, so why a woman do this, texting to an almost complete stranger all day?
She has a boyfriend, but texts me 24/7. Why?
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