If betrayal is so deep a part of human sin, and so profoundly entangled also with the story of love and salvation, then it cannot actually be betrayal per se that must be repressed or obliterated in the Passion. Rather, what is held up to us is the amazing possibility that even betraying, as well as being betrayed, can become part of the terrible stuff of being “handed over” to the full and deepest meaning of Christian love. God can make love, excessive love, even out of human betrayal. On this view Judas’s tragedy was that – unlike Peter – he despaired of that possibility; he could not conceive of that excessive sort of forgiveness.
–Sarah Coakley (more here)