A thousand times, this is the key. And even if you know in your heart that you are not in this women's league, I think the best you could do would be to be frank about your interest and to expect nothing from her. Could he say: "It is my impression that I have no business interrupting you, you are giving me no signs of a willingness to be contacted. I am attracted to you. I needed to tell you that. I assume you knew, and now I want to leave you to your privacy and I apologize. You are absolutely astounding to me. Have a nice day."?