Judas traveled with the apostles after the resurrection of Jesus Christ. When the gospels were finally written many years later, God refers to him as a betrayer more than 26 times. It is also recorded in Luke and John that the adversary had a hold of his thinking. He covenanted with the chief priests whom Jesus had confronted. He spoke up about the precious oil poured on Jesus saying that the money which could have been gotten for it could help the poor. Judas traveled with Jesus and saw the many things that he did for people, healing, blessing, teaching, boldly proclaiming freedom for anyone who believed. What was the matter with Judas!! Why does anybody refuse to see good? (I’m not going to answer that.)
Yes, he betrayed Jesus Christ and even when he saw Jesus Christ up and alive, he still chose another path. None of us can judge the heart of a man. It is the in Lordship of Jesus Christ that men and women exhibit their fruit. Judas could have turned his life around and done what Jesus Christ said in Acts 1:8. The choice was set before him.
But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
Instead he chose his own path again and that was it. I don’t know why. Whatever his reasons were, the power of God was made available to anyone who believed. Paul spells it out in Romans 10:
Romans 10:9-10 (Amplified) Because if you acknowledge and confess with your lips that Jesus is Lord and in your heart believe (adhere to, trust in, and rely on the truth) that God raised Him from the dead, you will be saved. For with the heart a person believes (adheres to, trusts in, and relies on Christ) and so is justified (declared righteous, acceptable to God), and with the mouth he confesses (declares openly and speaks out freely his faith) and confirms [his] salvation.
It is a free-will choice. The results of believing God for all truth seekers are way beyond what we could imagine. Look at Ephesians 1:17-19:
That the God of our Lord Jesus Christ, the Father of glory, may give unto you the spirit of wisdom and revelation in the knowledge of him: The eyes of your understanding being enlightened; that ye may know what is the hope of his calling, and what the riches of the glory of his inheritance in the saints, And what is the exceeding greatness of his power to us-ward who believe, according to the working of his mighty power,