Omg I feel terrible!!!

I was playing with my sweet boy today and we were playing tug of war. Well I thought I was being funny and kept putting my foot on the toy so he could snatch it away. I accidentally smacked his face with my foot. He cried and my heart shattered. I have NEVER hurt my dog and I feel absolutely Terrible. I’ve apologized and got down on the floor and hugged him. What else can I do to make it up to him?