How can you tell if a girl likes you but pretends she doesn't, and when she doesn't like you at all?

To be honest I can't tell when a girl is playing games like: playing hard to get or pretending to be uninterested when in fact she is actually interested or when she is in fact not interested in me at all.

Its sounds confusing I know.
How can you tell if a girl likes you but pretends she doesn't, and when she doesn't like you at all?
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