This happened to me except I was the girl. This kinda cool guy would hang around me. I saw him as a classmate...nothing more. I hadn't thought of him as a romantic possibility just a cool classmate. Well, he must've mustered all the strength he had and wrote me an anonymous note. It must've taken all the courage he had to tell me it was him. At the time all he did was creep me out. I told my friends (because I found it creepy) and I ignored him thereafter. As an adult I can see that even if I didn't like him I could've acted differently. Believe me when I say I wasn't trying to be mean. I didn't tell my friends to be nasty. I just found the whole thing uncomfortable. The bottom line is the same. You can tell her that you are sorry for making her uncomfortable then just leave her alone. There are some things that are just better left to be. The one thing I try to do to understand people is I try to put myself in their shoes. I really try to imagine things how they see it and not how I hope they see it. It might help you not jump to conclusions (that maybe she is being nasty) I hope this helps.