Judas Ischariot repented, but there is no word in Scripture that suggests God forgave him, and the facts prove that He did not. Right after his repentance, Judas killed himself, which is not an action done by someone whose sins were just forgiven.
Then Judas, which had betrayed him, when he saw that he was condemned, repented himself, and brought again the thirty pieces of silver to the chief priests and elders, Saying, I have sinned in that I have betrayed the innocent blood. And they said, What is that to us? see thou to that. And he cast down the pieces of silver in the temple, and departed, and went and hanged himself. (Matthew 27:3-5 KJV)
Judas repented. He wanted to give the money back, but this was impossible for him. So he cast it on the ground. He hanged himself for it.
God did not forgive Judas, or Judas would not have committed suicide. Suicide is translated as "Self Murder" in German, for example, and God's Word definitely says:
"But the fearful, and unbelieving, and the abominable, and ***murderers***, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death." (Revelation 21:8 KJV)
How could Judas ever have repented of his murdering himself?
God says, "Thou shall not kill."
Jesus prayed to the Father, "While I was with them in the world, I kept them in thy name: those that thou gavest me I have kept, and none of them is lost, but the ***son of perdition***; that the scripture might be fulfilled." (John 17:12 KJV)
However, we cannot condemn people who committed suicide, because we do not know their motivation, and we cannot know what God will do when the books are opened.... In Judas' case, however, it is very clear that he was condemned, and since he knew about it, saw no other way how to live on. It will not help him, however, because the dead will be raised for Final Judgment, too. Nobody can escape things coming by committing suicide, because life will go on after death. The question is just where to spend eternity - in Heaven or the lake of fire. Take a decision NOW.
God Bless You!