I am not too proud to admit I was wrong

Will started going potty so well. I was really surprised but also very pleased. While I'd like to believe my children are spectacular and different than other children, I'm not that naive. He just started going and never had an accident and I was hoping that meant that we would be free from all the annoying accidents other moms had to deal with. He went like a month with no accidents ever. Then he decided to be a normal child and wet himself whenever he pleases (which is usually in the evening). We were at the library yesterday and we weren't even there for longer than a half an hour when Will says, "Oh no. Mom look." I look and he's just peed on the floor! Rotten child. I was so angry. I tell him we are leaving immediately and he starts screaming his brains off. I had to tell a librarian and told her I'd clean it up but she said not to worry about it, that someone else would clean it. I'm trying to check out the books while Will is screaming and Isaac is running away from me. So now Will is back to diapers and he's not wearing underwear until he figures out how to pee in the toilet.