Is it normal that I get mad/sad when he doesn't text back even when he was online? Am I annoying?

CaitlinPerrieHAHS
I know I might sound creepy or crazy but I almost always text him first.
Most of the time (when he's online) he texts back right after I texted him (maximum 2 minutes later).
And sometimes I text something and he isn't inline for a long time.. ok I understand that but then when he's online he doesn't text me back (we text on fb so I know if he saw the text or not) most of the time he didn't "saw" the text... but that just means that he didn't click on the text it doesn't mean that he didn't saw it. And that's the moment mad at him or sad about it... I don't know

When we text he asks me questions and he sound interested & when I ask a question he doesn't give short answers there are always a bit longer... and we also flirt.
When we talk in school he smiles a lot when we talk or when we just look at each other. (One of my friends has another class with him and she says he's always so serious)
Is it normal that I get mad/sad when he doesn't text back even when he was online? Am I annoying?
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