I've heard this explained a number of different ways.. My belief if that Judas did not hang himself but committed suicide by putting a sword on the ground, blade up, then fell on it. Acts 1:18. In Matthew 27:5 the Greek word for hang "apanchomai" can also mean "choked up." So Judas didn't really hang himself but was choked up in grief. So much that he killed himself by sword later in a field.
Committing suicide by sword was common in the OT times.. Consider Saul..
1 Samuel 31:4 "Saul said to his armor-bearer, “Draw your sword and run me through, or these uncircumcised fellows will come and run me through and abuse me. But his armor-bearer was terrified and would not do it; so Saul took his own sword and fell on it."
Either way, he DID commit suicide..
The heart cannot rejoice in what the mind rejects as false - Galileo
We learn from history that we do not learn from history - Georg Friedrich Wilhelm Hegel
Finally, brothers, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable, if anything is excellent or praiseworthy, think about such things. -Philippians 4:8