Thanks to all of you for your responses. I don't feel that I'm really 'beating myself up' as 'acknowledging' I still have very deep feelings for my XH. I've managed to bury those feelings for so very long, they simply SPRANG on me.
I know from other threads, such as yours Bea, that long periods of time can go by and these things just pounce on you. I'm living my own life, quite cozy and quite busy, and for the most part, very happy. Just wasn't prepared for that surge of 'guilt' I was feeling along with a strong feeling for my XH.