Why are some people so passive aggresive?

had my first ever experience with someone passive agressive and now i feel like i was led on completely played and used to build a girls ego (no i do not mean girls specifically i am just refrenceing one)

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background this girl continuously made me feel like she enjoyed the attention i gave her for 4 months straight mabie im bad at reading signals but ussually smileing talking to your freinds in a happy way about me and your freinds teasing you about me is not a bad sign or at last last i checked?
Why are some people so passive aggresive?
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