What are signs they like you?

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There's a boy in my school I have a huge crush on. We met last year and have quickly become best friends, and now.. I want something more than that. I've never seen him talk to another girl, much less hang out with one, besides me. And he's such a family sweetheart! Made his dad tear up for Father's day by making him a sweet card. 💘 Anyway, what are some signs?