It is not so much that he gave up a pawn but more so that you took it.
But in fairness to you your position was already problematic after 9..Ne5.
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Some people like to play for traps, I like to disarm them.
(* GM Simon Williams said that there are no traps against the English Opening - 1.c4, so that's a way to disarm them all..)
Number 1: Some guy at the lichess.org Arena gave up a pawn, and suddenly he has a 'wife or life' (mate or your queen) attack. let's see:
Opponent's info:
1 inaccuracy
0 mistakes
0 blunders
27 Average centipawn loss
His accuracy is also close to perfect, so I guess people always make the same mistakes against this.