Jesus' words flashed through Peter's mind and he went away, weeping bitterly - Matthew 26:75
God offers forgiveness for even the worst of sins and the worst of sinners
Peter learned this firsthand
Theories abound as to why Judas' motivation for betraying Jesus, but for Peter it was clear, he was afraid
Judas and Peter both:
Two remorseful sinners but only one turned back to the Lord