You want to be really sure that there isn’t feelings there, I was friends with someone whom I NEVER thought I would look at differently but when I least expected it both how we viewed each other had changed. He was my friends boss whom I became friends with, we would talk about anything and everything, including dating and men. He would always give me advice which was better than anything I ever heard from my girl friends. He was married when I met him but was divorced when the feelings changed. One night I called to see what my friend was doing for dinner and he answered and told me she had left already for a dr appt. We began talking as we always did and decided to grab dinner together and then we went back to the place where they worked and watched a movie together. When we were leaving there was something there that had never been there and we kissed. Later that night he called me and told asked me if I wanted to date each other and such. To my surprise the answer I gave was yes. He was the love of my life and I will always care about him even though he passed of cancer 3 yrs ago. So just be really sure that without you knowing it your feeling haven’t changed, maybe be more open and go out one night. You don’t want to miss an opportunity if they have and your subconscienc just hasn’t clued you in yet.
Good luck!