While he was still speaking, there came a crowd, and the man called Judas, one of the twelve, was leading them. He drew near to Jesus to kiss him, but Jesus said to him, “Judas, would you betray the Son of Man with a kiss?” Luke 22:47–48, ESV
When the dogs and swine come to harass and distract it is not pleasant, but I can bear it. However, when someone approaches this ministry as if a friend only to be discovered later to be a deceiver it is somehow much more difficult to bear.
When one breaks the bread of the Word of God with us then turns on us it is a bitter thing. Why? Deceitfulness is as the word suggests, it is the process of deception, for whatever purpose, that causes trusts to be broken and fills us with anguish and grief. It is hurtful.