3 Answers

I always asumed it was guilt... I have heard sermans on it hat look farther into it but .I still stick with plain old guilt.

I would think out of guilt and shame and deep sorrow for what he did.

The Bible does not discuss in detail the motives for his corrupt course, but an incident that occurred on Nisan 9, 33 C.E., five days before Jesus’ death, sheds light on the matter. At Bethany in the house of Simon the leper, Mary, Lazarus’ sister, anointed Jesus with perfumed oil worth 300 denarii, about a year’s wages for a laborer. (Mt 20:2) Judas strongly objected that the oil could have been sold and the money “given to the poor people.” Evidently other apostles merely assented to what seemed to be a valid point, but Jesus rebuked them. Judas’ real reason for objecting was that he cared for the money box and he “was a thief . . . and used to carry off the monies” put in the box. So Judas was a greedy, practicing thief.—Joh 12:2-7; Mt 26:6-12; Mr 14:3-8.
Betrayal Price. Judas was undoubtedly stung by Jesus’ rebuke about the use of money. At this time “Satan entered into Judas,” likely in the sense that the traitorous apostle gave himself in to the will of the Devil, allowing himself to be a tool to carry out Satan’s design to stop Christ. A few days later, on Nisan 12, Judas went to the chief priests and temple captains to see how much they would pay him to betray Jesus, again showing his avarice. (Mt 26:14-16; Mr 14:10, 11; Lu 22:3-6; Joh 13:2) The chief priests had that day met together with “the older men of the people,” the influential men of the Sanhedrin. (Mt 26:3) The temple captains may have been brought in because of their influence and to lend legal flavor to any planned arrest of Jesus.