Judas was not a righteous man, and he almost certainly died in his sins. One, his sorrow was absolutely not to repentance, but personal remorse that his plot failed. It is clear from the historic setting in which Judas operated, he was a radical Zealot who's efforts that got Christ condemned were aimed at forcing Jesus to bring about His kingdom, thus routing Rome and establishing Israel as the center of the world again. This is what the Zealots thought would happen when Messiah came. You're quite right in that Judas believed that Jesus was Messiah, but he did not believe the message Jesus had preached for three years. In fact, Judas probably hadn't even heard the message of personal reconciliation to God as it was intended, seeing Jesus only as a means to an end, i.e., the reestablishment of Israel to preeminence.
Matthew 27 NASB
3 Then when Judas, who had betrayed Him, saw that He had been condemned, he felt remorse and returned the thirty pieces of silver to the chief priests and elders. [emphasis added]
The word "remorse" is the Greek
metamellamai and means personal regret, not a Godly sorrow (see 2 Corinthians 7:10) leading to repentance. Though the word has been translated "repent" in other venues -- not the Bible -- the only repentance that occurs with
metamellomai is a personal decision never to place one's self in a compromising or uncomfortable situation again, because it is embarrassing. While it cannot be stated unequivocally one way or another based on what the Bible says about the condition of Judas' heart, his remorse and his suicide suggest something other than righteousness.
we understand your point, but do not forget that namely Jesus Christ is the Good Shepherd Who has said:
John 10:11-18 "I am the good shepherd: the good shepherd giveth his life for the sheep. But he that is an hireling, and not the shepherd, whose own the sheep are not, seeth the wolf coming, and leaveth the sheep, and fleeth: and the wolf catcheth them, and scattereth the sheep. The hireling fleeth, because he is an hireling, and careth not for the sheep. I am the good shepherd, and know my sheep, and am known of mine. As the Father knoweth me, even so know I the Father: and I lay down my life for the sheep. And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be one fold, and one shepherd. Therefore doth my Father love me, because I lay down my life, that I might take it again. No man taketh it from me, but I lay it down of myself. I have power to lay it down, and I have power to take it again. This commandment have I received of my Father.",
Matthew 18:10-14 "Take heed that ye despise not one of these little ones; for I say unto you, That in heaven their angels do always behold the face of my Father which is in heaven. For the Son of man is come to save that which was lost. How think ye? if a man have an hundred sheep, and one of them be gone astray, doth he not leave the ninety and nine, and goeth into the mountains, and seeketh that which is gone astray? And if so be that he find it, verily I say unto you, he rejoiceth more of that sheep, than of the ninety and nine which went not astray. Even so it is not the will of your Father which is in heaven, that one of these little ones should perish.",
Matthew 12:10-13 "And, behold, there was a man which had his hand withered. And they asked him, saying, Is it lawful to heal on the sabbath days? that they might accuse him. And he said unto them, What man shall there be among you, that shall have one sheep, and if it fall into a pit on the sabbath day, will he not lay hold on it, and lift it out? How much then is a man better than a sheep? Wherefore it is lawful to do well on the sabbath days. Then saith he to the man, Stretch forth thine hand. And he stretched it forth; and it was restored whole, like as the other."
why did not Jesus get away when He knew that the pharisees and scribes can catch Him?!, He was able very easy to abscond, but stayed there as though to wait for someone, e.g. for some lost sheep of His fold, He knew that judas knew that place:
John 18:1-3 "When Jesus had spoken these words, he went forth with his disciples over the brook Cedron, where was a garden, into the which he entered, and his disciples. And Judas also, which betrayed him, knew the place: for Jesus ofttimes resorted thither with his disciples. Judas then, having received a band of men and officers from the chief priests and Pharisees, cometh thither with lanterns and torches and weapons."
here is how Jesus behaved exactly as He has said according to the above biblical passages, because namely He is the Good Shepherd, while in that case judas was the lost sheep of His fold, or how can you imagine the Lord Himself Who is the Good Shepherd to forsake His lost sheep and thus to discredit Himself towards the whole world?!, hardly for Him was preferable to run away from His responsibility, but here is how He readily gave His life for the lost sheep:
John 18:4-5 "Jesus therefore, knowing all things that should come upon him, went forth, and said unto them, Whom seek ye? They answered him, Jesus of Nazareth. Jesus saith unto them, I am he. And Judas also, which betrayed him, stood with them.",
Luke 22:47-48 "And while he yet spake, behold a multitude, and he that was called Judas, one of the twelve, went before them, and drew near unto Jesus to kiss him. But Jesus said unto him, Judas, betrayest thou the Son of man with a kiss?"
apparently it is quite visible that Jesus went and waited there specially for judas, because why He to risk His life vainly?! - what's the point?!, but there must be a really good cause of life-saving act because of some human who is in trouble, but in the case that man came to sell out Jesus, because he was possessed by satan being thus as a greatest apostate - his soul was in great danger, and that man was one of the twelve i.e. one of the most direct disciples of Jesus, then how much more judas was a sheep of His fold?!, and if Jesus has saved one villain(Luke 23:42-43), then how much more His most direct disciple?!, moreover not they chose to be His disciples, but He chose and called on them
John 15:16 "Ye have not chosen me, but I have chosen you, and ordained you"
let's do not make God unfair/lying
Blessings