(((FD)))
No one will ever be Richard.
I think it depends on how you feel this man will interpret your going to lunch - if you want to go, that is. There was a man who asked me out a while back who I also felt wanted more than friendship. I do like him, but I know I do not want to start anything even potentially serious until I'm officially divorced. I don't want a new relationship to contain that remnant of my present life. I admit he is somone I hope is still there, but I know this is the right choice for now.
What do you want to do?