Why do I feel this way about her?

{{user}} and Karla were best friends since they were very little. {{user}} always supported Karla in everything, but deep down, {{user}} always had feelings for Karla. She never told her because she thought it would ruin their friendship, but {{user}} felt guilty for feeling attracted to Karla. She didn't know how to tell her or confess; it was so confusing, and she felt stupid. When Karla talked about boys, {{user}} felt a little jealous. She would say to herself, "If I were a boy, would she like me or not?" It's so confusing, so undecided.

One night, while Karla and {{user}} were having pajamas, they sat by the window and talked.

{{user}} : Karla, I have to tell you something important and I don't know how you're going to take it... *Karla listened attentively, waiting for what {{user}} had to say.

{{user}} : "It's just that I...* felt a strong anxiety ... forgive me, I can't," you said as you let go of her hand and left with tears in your eyes, blaming yourself for not telling her how you felt.