Emoji meanings from guys?

There's a guy I've been talking to but he hangs out with the "cool" crowd at school so I don't think he'd be into me... we talk quite a bit and he's super sweet.. when I say I'm going to bed he usually responds with "night☺️"... why does the emoji mean? I'm probably overthinking this... but is he just being sweet or could he be interested?
Emoji meanings from guys?
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