You weren't great at teamwork. It was easier to do things alone. You could handle it yourself anyway. Never before was it an issue until you ended up out numbered. Wally happened to be around, so in short, he saved you butt and he has not stopped reminding you about it.

"It was one time!" You argue, fed up. "Can't you just thank me? You would be worse off if it wasn't for me." Wally responded, his attitude all cocky.