Getting over your best friend

Hey everyone. So I'm looking for a book to help me deal with the situation I'm currently in. Basically, I fell for my best friend a year ago and recently realized that he's never going to need me the way I need him. I let him know about my feelings and then told him that I needed some time and space.
I searched Amazon but all the books about getting over someone focus on breakups or on the guy's faults. Not what I'm looking for. Could anyone recommend a book about getting over your best friend?

Thanks a lot!