What should I do, should I tell her?

Okay. I am positive that she would rather know the truth than be lied to, don't you agree? put yourself in her position. lying hurts more. You need to tell her. She should accept you because she obviously loves talking to you! Also, if she doesn't accept you, then it's fine. make new friends. you don't need a cyber friend. Maybe SHE isn't who you think she is either