Love and friendship... where is the line?

It has been a while since last time I posted something to discuss about. This time, I would like to open our conversation with a topic that, even it's been long discussed, still intrigues me. Im sure we all have seen films about it, read books and stories related to it but the questions is still in the air.... Is it possible to have a very, very, very gooood friend, grow and nurture a close relationship and not to fall in loved with him/her? Is it possible to see the line between friendship and attraction? If one person starts having feelings towards that friend, is it worth telling him/her about it? Could that friendship be ruined? Humm... what do you all think?