Girl is very dry and short with me through texts, but in person and on the phone it's different, why?

Anonymous
Whenever I text this girl its always one word answers or something like "lmaooo ok". The thing is that when I see her in class, she is on the phone texting the whole time. So I automatically think she's just like that when she texts me. Now when we hang out or when we talk on the phone, she's very friendly and flirty. She even calls me cute nicknames and doesn't want to get off the phone. Am I worrying too much? Why would she act different through texts than on the phone. I mean, I know she texts people a lot. I can't help but think that she's texting some other guy. We are just friends right now, but I like her, and she USED to like me a lot. I am not sure how interested she is right now. Can someone maybe explain this behavior? Thanks
Girl is very dry and short with me through texts, but in person and on the phone it's different, why?
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