What should I do??

I(18M) have a girl bestie(18)...She was my classmate in my previous school and at this point we are almost 10 years together as friends......but I love her , I love her from the deepest core of my heart , I don't think that she has any feelings towards me(though she loves me as a friend very much and that's why we are bestfriends)...now one of our common friends told her that I secretly love someone, now she is asking me about my crush from yesterday. When I denied to tell her the name then she started asking for the 1st letter of the name... Should I confess my feelings?? But what if she breaks the friendship after knowing it...pls help me...

edit : To make things a little clearer I am not talking about having a crush on her. I love her.