I think Judas was Saved. I also think we need to remember that Judas was possessed by Satan so to betray Jesus.
I think that explains why Judas hanged himself. Cursed is anyone who hangs on a tree. And his repentance is on record when he went to the temple and returned the silver.
Satan in possessing Judas so that Jesus could be crucified and fulfill his purpose in dying as the unblemished lamb taking the Sins of the world upon Himself actually took the power of death from Satan.
God works all things for His purpose. That's Sovereign Dominion.
That's our Father!
I think it would even be better to remember that Judas didn't blame Satan for his actions. Judas, very obviously, felt guilt, shame and sorrow (albeit ungodly!) for HIS sin. This is why he hanged himself! He even admitted his sin when he returned the pieces of silver.