Originally posted by angelsflame265
he could've been nice like 1-6th year or something or during hogwarts then something happened to make him get mad (like a joke went to far in his opion or whatever) and he just swiched. .or he was a friend of the familys and they knew him sense they were all little
I think that J&L&S trusted Wormtail until the very end. Remember that Wormtail was James' secret keeper. I think that Wormtail was lured by the power the Voldemort promised, and perhaps a bit scared by him, and cared more for himself than his friends, and gave James' secret away