Girls, How do I know if she likes me?

I met her online few 2 years back. Since then we have been very good friends. But now i have developed feelings for her and I don't know if she knows that. We talk a lot on phone but we have never met in person as she lives very far away. Should i wait until we meet in person. I'm afraid that if i tell her i may lose her as a friend which i never want.

Girls, How do I know if she likes me?
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