Is it normal my girlfriend made a "pinky promise" with this male coworker of hers? why? she told him "i'm your biggest fan here, I love ur energy"?

WHy would they make a pinky promise to each other? what the hell does it mean anyway? and should i be concerned? she posted a story of her dog on instagram, and she reply to the story saying "I love the dog"... she told him "he'll get to meet you one day then". am i exaggerating?
Is it normal my girlfriend made a "pinky promise" with this male coworker of hers? why? she told him "i'm your biggest fan here, I love ur energy"?
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