I can totally relate to your post granite1. In fact during the past weeks I started missing terribly my T for the first time, even though I've been seeing him for 2 years. I could never tell him...
In my opinion, the whole point of telling them is not to see what their reaction or answer will be, but to manage to do so, as a proof that we are not afraid to communicate our inner feelings and thoughts. As a sign of trust towards them. Maybe it will also be a good starting point to explore why we suddenly miss them. Maybe something else is going on that causes us to feel we miss them that we are not aware of? Something unexplored, that needs to come out.
So I really believe that if we manage to tell them, it will be a truly good sign of trust and of not being afraid to feel a little vulnerable and unprotected towards them.