Greed, and not knowing how to mate.
HOW DOES WHITE LOSE THIS GAME????

How does White lose that game? Obviously his last two moves. :)
All White had to do to win the game would have been to check the black king on f4 with ...Qf4+ on either move 40 or 41 (forking Black's king and queen). The queens would be traded off, and even though White would lose the knight, White would still have winning material.

ya big time, I blundered too much, and was left in desperation mode lol .... that opening is too aggressive and I rarely see it backed up by any defence if it fails
https://www.chess.com/live/game/2588904620