Girls, what are some reasons you give a guy mixed signals?

Mixed signals, like, you'll convey interest (texts first, smile, wave) sometimes, but then be the complete opposite other times (ignoring in person, not acknowledging his presence)

Or what's usually the main reason among these:
I don't "like" him, but I like his attention, so I'll lure him in, then shrug him off if he gets too close
Mood swings. Having a bad day vs being in a good mood
I give mixed signals to guys I like.
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Girls, what are some reasons you give a guy mixed signals?
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