Prayer to help me to get past the extreme guilt

Pray my soul is saved, for I betrayed someone terribly and now cannot live with myself. Please help me to get past the extreme guilt, to go on to serve you, our Lord as I should. Cleanse me please, I am a Judas. Please cast out the demon that tries to possess me. I love you Jesus for ever. Thank you for any grace you may bestow upon me. Thank you for everything. Amen.