I think she's playing with me..or is she not?

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I think I'd had this problem for weeks already. I have this classmate of mine who knew that I am a bi..then she caught me once, writing the name of this girl. We became friends, not acquaintances. We talk a lot to each other if ever we see each other. That was then for like three weeks then after that, now she's like "flirting" with me. and I don't know what to react anymore. It's bogging my head ugggg