Lovers and Friends

I know that it's always good to be friends first but how do you know when to take it to another level. There is this guy that is my really good friend but I love him and he loves me. We act like we are more than friends but we never made it official. I don't know what he is waiting for. He is my heart and I can't imagine living without him. He tells me all the time that he loves me and can't live without me but I don't know whats the hold up. I want to marry him one day and I know we are not ready to be together. You know how you can look someone in the eyes and feel what they feel? That's how it is. I Know we arent meant for eachother but I don't know where to go from here. What do you think?