Wormtail
Or, perhaps, you've been told things that you simply do not wish to believe. The two are quite similar, I can see how you'd easily confuse them.
That being said... at some point clearly in your future, you will betray the Potters. You will provide their location to the Dark Lord, and he will then kill them.
Shall I continue, or are you going to now begin stating that I'm spouting nonsense and lies?