Why a girl acts flirty but won't take me seriously when I hit on her?

I'm pretty sure I am in the friend zone, but we aren't friends really, she calls me when she cries, she touches my ass and says she likes it, she acknowledges when I prove my sexual desire but seems to take it has a joke, sometimes she checks on me with a message or phonecall, is she politely rejecting me or is there still any chance?

Why a girl acts flirty but won't take me seriously when I hit on her?
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