Ahhhh the unknown.. I know its scary.. But, best advice I can offer is tell him how you feel..Maybe he feels like he is in your " friend zone" too..

Im 43 and over 13 years ago I told my "best friend" that I loved him and he loved me back, he was feeling the same way , but not sure how to tell me.. Silly man . lol

Often the best long term relationships start as friendships first. Be brave