Lily and James only made you Secret-Keeper because I...

Lily and James only made you Secret-Keeper because I suggested it,” Black hissed, so venomously that Pettigrew took a step backward. “I thought it was the perfect plan... a bluff... Voldemort would be sure to come after me, would never dream they’d use a weak, talentless thing like you... It must have been the finest moment of your miserable life, telling Voldemort you could hand him the Potters.