My best friend stares at me like she is flirting?

OK imma girl and im bi curious so i have this friend and she has a boyfriend but whenever we are in a group of people we know, she just stares at me like a hawk and like she is flirting with me. ever since last year she would tell me that when she was in elementary school she would be curious and kiss girls and she would describe the differences between how boys and girls kiss. she tells me how she is still friends with this one girl she kissed. whenever she sees me, she gets all happy and runs to me to hug me and when she hugs me she giggles like how kids laugh. she has been like that even before she had a boyfriend too. could she be bi-curious and have like a crush on me or just...idk help!!!!!!! :o