Thank you all for your posts. I ended my relationship because of the feelings I have for this man. He is, as yet, unaware that I am single.
I suppose what is driving me to post, and to feel (wrongly) that it's a case of now or never, is that these feelings don't seem to be going away. Because we've never discussed it, and (of necessity) have had little time together and rarely been alone, I really have nothing to go on but instinct.
I would like to write more, but am concerned about being outed in RL. I am aware, of course, that counter to my intuition, he may have no feelings at all for me, and that if he does, they may be of a wildly different tenor from my own.
Perhaps in time these feelings will fade, and if things don't happen, in the right way, then it's not meant to be. To be honest, if someone described this situation to me, I would think they were a bit mad.
Thanks again.