Why is my crush being so bitter and/or passive aggressive?

She texts me "Tomorrow is the big night", referencing the fact I'm going out tomorrow night. I tell her I'm going out tonight instead with this girl we both know (it isn't a date).

My crush tells me "Oh yeah, that's right, she's in England. Why not try it on with her, she's open to all propositions". Basically my crush thinks she's a ****.

She's confusing me so much... what's wrong wit her?
Why is my crush being so bitter and/or passive aggressive?
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