How do you really know your in love?

How do you really know if your in love or not? Could i be convincing myself i'm in love with this guy? I looked at pictures of him and his girlfriend and i did feel a bit jealous, It's made me a bit upset and feel really down about myself. Is this love though? How would i know that i was in love with him? I felt like I've liked him a lot for the past few years? Is there signs? Thoughts that i would have? Feelings when he's around? How do you know if you just fancy someone, or you actually love them?

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