As we know building relationships is important. what does it mean if a girl in a relationship asks for your number as a guy? she wants a guy friend?

i was slightly surprised she say she had a boyfriend and afterwards asked for my number.
Does this mean me and her vibe? And she felt good connection? i don’t know her personally and don’t know if she actually had a boyfriend.
As we know building relationships is important. what does it mean if a girl in a relationship asks for your number as a guy? she wants a guy friend?
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