Carole,
Like Johanna said, it was an accident!! I can't count the number of times I've stepped on one of my cat's foot, tails, etc. One time I actually TRIPPPED over Moo while carrying something out of the oven. Fortunately it landed in the kitchen since instead of on him.
Believe me, he'll live. Just give him lots of love and kisses when he gets home. I'm SURE he'll forgive you.