If you think about the story at the most random times (for instance: during school, while you're eating, in the middle of a conversation) and wish you were reading it instead.
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If you feel more alive with the characters in the book than with actual people (certain ones, anyways).
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If the dialogue makes you feel like you're in the conversation.
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If you stalk the author on their social media (provided they're still alive and actually on social media).
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If you read a sentence in the book more than once because you want to fully soak in the beauty and meaning of it.
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If when a friend asks you "So what are you reading right now?" and you immediately go into a detailed explanation of why the book is amazing.
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If you begin to daydream about writing fanfic for the book before you've even finished it.
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If you start a storyboard for it on Pinterest (perhaps even before you've finished it).
If you start a storyboard for it on Pinterest (perhaps even before you've finished it).
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If you read the last chapter really... slowly... because.... you don't... want... it.... to end.
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If you begin an online review of the book for your blog (or for Goodreads) before you're finished with it because you know you're going to continue loving it to the end.
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If the book is in buried in your bed covers somewhere in the morning when you wake up....
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It's probably a good book.