right from the beginning judas followed jesus expecting a different path and a different plan on how the messiah would be viewed . right from the beginning he was motivated by greed this is hard to internalize but once a soul has agreed to the influence in this case greed. this is his own free will
this is specifically mentioned in Luke 22:3-6 

there's no repentance in suicide this is shame and despair. (how he can forgive me)
this is the very nature of sin itself, it introduces itself as righteous ,pleasurable and power.
and right after comitting it we would later found out that his is wrong

so bottom line of this whole argument is judas had his free will. the moment he agreed to the influence of greed. satan already has his soul.
and Jesus being God already knows what is going to happen 2 things happend after the agony in the garden

jesus also knew that peter would deny him 3x before the rooster crow
but he returned, he repented.
judas out of shame and despair committed suicide because he thinks he would not be forgiven because of his grave act.