When you ask a guy if he's okay and he says, "yeah", is he really okay?

When you ask a guy if he's okay and he replies with "yeah" is he really okay?

because today my crush came into class

and put his hands over his face and like looked

frustrated/sad and I was like are you okay? And he's like "yeah" in a sad voice. And I'm just worried about him and I want him to know that I'm there for him if he ever needs to talk because he NEVER acts like this and its worrying me.
When you ask a guy if he's okay and he says, "yeah", is he really okay?
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