Johnlambert, how could you??? I always thought you were a lovely guy!!! LOL
Whether someone is married or living "in sin" (ridiculous term really!), the partner or soon to be ex-partner deserves an explanation. Just walking out without a word is totally disrespecting the good times you both had together at some point int he relationship.
My second husband gave me a fabulous explanation, one which still baffles me to this day! He said (after being told I had bone cancer) " I love you too much to watch you die. " Then he left. Four years later, when I had won my battle against this disease, he was begging to come back! Silly sod!!!
I know at times it would seem far easier to do a "Beam me up, Scotty!", but it would be inexcusable!