Girls, Is this girl in an open relationship?

Anonymous
Long story short. I asked her out. She has a partner. So we were going to go out still but she wanted to bring a friend because she knows I like her. After that I confirmed that I do like her. And her partner said I can’t go out with her anymore. But I see her hanging out with other people (girls and guys) and she puts hearts and all that near them in her Instagram story. Also important to note. She puts way more hearts and everything else into her pics with her partner. Is this a girl thing or is she in an open relationship?
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Girls, Is this girl in an open relationship?
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