My heart just sunk...

It's not often that I publicly admit that I am feeling sad or blue, but today is quite the exception. I normally try to keep my blog posts upbeat with a light touch of humor, but I feel so much anxiety about the following situation, that I thought I would put my saddening problem out on the blogger world and see what advice I get back.

Problem: I left our new home today to meet George afterschool at grandma's house. When I arrived, George was standing across the street at the neighbor's house. He was in the yard talking with the little girl his age and her mother. As I pulled up I could see that he was clearly upset. George climbed into the van, and with tears rolling down his cheeks he mumbled through broken sobs, "the boys are mean to me." To find out more about what he was so sad about, I rolled down my window and asked the neighbor girl what happened. She informed me that the other boy they walk to school with everyday had started teasing George. George asked the boy to stop many times and told the boy that he didn't like what the boy was doing. Apparently this started happening over the last week, and today it escalated to other boys joining in. The first boy was incouraging the other boys to tease George as well. George told me how the first boy started by calling him names and telling him that he didn't like George, and today the first boy got a group of older boys to join in.

George was so upset and he didn't know what to do. I too feel upset because I am not sure that I know what to do either. I told George to just tell the boy to stop and if he doesn't to walk away and not walk home with that boy. I practiced with George a few times so he would know what to say to that boy. What should I do to make sure this bullying stops before it catches on? Please share all your advice, I feel at a total loss.