You were systematically ruining your pawn structure, giving him many many weak points to attack. Your blunder was simply losing hanging too many pawns (and that bishop). Keep an eye on them the next time. He didn't have to do 'anything' at all; just grab grab grab material.
What to do what to do.
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I'm pretty sure I could have won this, but I wasn't sure how. Then the tension just kept growing and I was the one to give with a blunder. Help?