Pease help!!

I have recently moved so that means I have left my boyfriend, and him and I are still dating and it's going great but I am really good friends with this boy at my new school and somehow I have become fond of him I like him..... My friends there tell me I should tell him because no girl at this school has ever liked him but I told them that I have a bf they said that I don't have to encontro, data him all I have to do is let my filling out and that he might like me one girl told me that if me and my boyfriend broke up that I could go to this guy! I don't know guy if I tell him I like him will it be right or wrong?.....