Hi pls help?

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i like a girl in my class.But i hadnt tell her abt that.But i think she know that.in class i always have a look at her.Nowadays she doesnt talk to me in class.but i talks to her in phone and sometimes chats with her in internet.i messages her to come online and she always come.She hadnt tell to my friends that i phones her.she also looks at me in class and always have a smile.But she is not talking to me in class.What do u think about this