Girls, What does it mean when I tried backing off from a girl, but she still starts conversation with me?

So I really like this girl but she does have a boyfriend. So I tried just backing off and she still started conversation with me by asking " how was your lunch on the weekend?". Then I asked how hers was and she pulled out her phone to show me the cheese platter she made.
Girls, What does it mean when I tried backing off from a girl, but she still starts conversation with me?
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