Why does this girl seem so nervous around me if she knows me?

Anonymous
I see her interacting with people (some of them she has known for far less than she knows me) and she is so friendly, comfortable and chatty. She talks with me, but sometimes she looks all nervous, I make her smile and she doesn't even look at me, she just smiles and sometimes calls me a name (weirdo, big headed, pretentious).

She is always looking at her phone and seems like she isn't listening to me (but she is) she remembers almost everything I tell her (even stuff I forgot I said lol) but when she is talking with others, she is looking at them.

What is weird is that she is so comfortable teasing me and being a smartass to me, also she can be really mean (playfully) and she is all smiles when she does it and seems to have fun and we go back and forth a lot and also we have our serious chats but what gets me is that she gets so serious and quiet sometimes and only with me, if I try to push for a conversation she gets annoyed.

Why do I have so much trouble getting her comfortable with me?
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+1 y
I like her but the thing is that when she gets all serious or quiet with me and chatty with others, I get so annoyed. We talk and we have fun but then there are days when she acts a bit off and is kinda grumpy and quiet with me and while there's a nice balance of teasing and chatting, those days she is just giving me a hard time and seems like she "doesn't like me" that much, but then it goes away. I just wonder why she changes from day to day?
Why does this girl seem so nervous around me if she knows me?
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