Because Jesus is compassionate and merciful and not willing that any should perish. His ways are not our ways.
Jesus did not give Judas any 'secrets.' Jesus said that he spoke nothing in secret (John 18:20). This question is based on the false gnostic 'gospel' of Judas, which is false, because it was written at least a century after Judas committed suicide, & it teaches a false God, false Christ, & false plan of salvation. It also teaches that the soul is good, but that all matter is evil, despite the fact that Jesus was not only 100% God, but also 100% human, which was completely sinless - which would include his flesh, which is made up of matter.
The idea that Jesus revealed "secrets" to Judas that He revealed to no one else is not biblical. In fact, Judas was dead when Jesus "opened the understanding" of the apostles (Luke 24:45), so the fullest truth was never known to Judas.
This was Judas Iscariot - he betrayed the whereabouts of Jesus so he could be arrested in secret - for 30 pieces of silver (about a month's wage).
30 pieces of silver
In their first conversation they discussed how much the priests would pay for Judas to betray Jesus. In their meeting after the betrayal, Judas realized that he had given Jesus up to be killed and gave the money back. Judas then went out and hung himself.
Judas betrayed Jesus once. Peter denied Jesus 3 times.
Jesus had two disciples called Judas. One was Judas Iscariot, the other was just called Judas. Judas Iscariot is not known as Jesus brother, actually, he was the follower of Jesus that betrayed him to the Pharisees.
Judas was the chosen one because Jesus entrusted his secret with him. Jesus could only trust Judas to ensure that he would be handed over to the romans so complete Jesus's story. Additionally, Judas was the strongest of all the disciples and Jesus knew he could withstand the torment / rage / anger of the other disciples who simply did not understand Jesus true purpose
Judas iscariot betrays Jesus
Judas Iscariot
The disciple that Matthias replaces after Judas betrays Jesus is Judas Iscariot.
The disciple who betrayed Jesus was Judas Iscariot.
no Judas did not arrest Jesus he told the Jewish council where Jesus would be for a reward of money