Her best friend is upset that I like her more?

does that make sense? i've been spending a lot of time with this girl as she is a server at a place that i go to and we hang out there. but a couple of her girlfriend's also work there. this one i used to also spend a lot of time with but never dated as she had a boyfriend

but now she's upset that when i go there i spend time with the other girl instead and don't talk to her as much. you can just see the look on her face when i do that

so she must like me or be bitter that i like her best friend so much?
Her best friend is upset that I like her more?
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