Theophylact of Ohrid

Note also the word "goes," for the death of Christ was only a departure, not a death. "It would have been better for that man not to have been born." This is said in regard to the punishment to which the betrayer will be subjected. For it is better not to be born at all than to be born for torment. Thus, in regard to his final destiny, it would have been better if Judas had not existed at all. …

Commentary on Mark ↗

Irenaeus

But Judas having been once for all cast away, never returns into the number of the disciples; otherwise a different person would not have been chosen to fill his place. Besides, the Lord also declared regarding him, "Woe to the man by whom the Son of man shall be betrayed;" and, "It were better for him if he had never been born;" and he was called the "son of perdition" by Him.

Irenaeus Against Heresies Book 2 ↗

Bede

And indeed, the Son of Man goes as it is written of him. But woe to that man by whom the Son of Man is betrayed. Neither at first nor second admonished does he withdraw his foot from betrayal, but the patience of the Lord nourishes his impudence, and he treasures up wrath for himself in the day of wrath. He predicts punishment, so that whom shame did not conquer, the announced torments might correct. …

On the Gospel of Mark ↗