What does it mean when a guy goes out of his way to talk to you?

kao118
(This is for my sister, and she’s 14) We just moved and my sister says that a guy in her class came out of his way to talk to her. Apparently, he seems nice and friendly (maybe a little too much for my taste) when they talk, but he doesn’t smile or greet her if he sees her in the hallway? Is it normal for guys to do this? For added context, She’s kind of cute too, but not your average popular girl - she’s sometimes an insufferable know-it-all and overeager to answer any question in class, but very friendly and will talk to anyone. However, I’m terrified that they’re going to hurt her as she’s been pitifully deprived of guys for the past few years in COVID and doesn’t know anything about how they act.

And while we’re at it, do guys like it when girls always know the answer to every question in class or do they think of them to be too overeager and annoying?
What does it mean when a guy goes out of his way to talk to you?
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