When can you say that you're IN - LOVE?

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Sometimes, we thought we're already in-love to a certain person, we thought we're happy, we thought we couldnt live without him/her, but sometimes, we also realize that, its like there is something missing, emptiness when we're alone, its like... yes, im happy if im with him/her, but am i happy if he/she is not around? Sometimes... you're confuse. So... When can you say that you're already fall in a crazy little thing called love?