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A guy who acts like a saint until he turns into a total jerk just to mess with you and your friends. He hangs with the popular kids like they're the only ones who matter.
You: Hey, you're cool. Mackary: Yeah, I'm cool. Then he goes to lunch with the cool kids and forgets you exist.
He laughs at your dumb jokes but then tells everyone you're a failure.
He promises to help you with homework but spends the whole time texting his crush.