What went wrong there?

After this quick loss, Black was not sure what he did that was so bad. Come and look for clues with me...

[Event "?"]
[Site "?"]
[Date "2012.??.??"]
[Round "?"]
[White "Rutland, William"]
[Black "Stuart, Ben"]
[Result "1-0"]
[ECO "C55"]
[PlyCount "29"]
{After this quick loss, Black was not sure what he did that was so bad.  Come
and look for clues with me...} 1. e4 e5 2. Nf3 Nc6 3. Bc4 3... Nf6 {
Nothing wrong with any of that - this is the fine Two Knights' Defence.} 4. Nc3
Bc5 (4... Nxe4 $1 {is the easiest way for Black to get at least an equal game.}
5. Nxe4 (5. Bxf7+ Kxf7 6. Nxe4 d5 7. Neg5+ Kg8) 5... d5 {
The fork regains the piece.} 6. Bxd5 (6. Bb5 dxe4 7. Nxe5 Qg5) 6... Qxd5 {
Black has a fine free game, with easy development for the Bishop pair.}) 5. Ng5
$6 5... O-O 6. O-O (6. Nxf7 Rxf7 7. Bxf7+ 7... Kxf7 {gives up two active
pieces for a pawn and a Rook that probably wouldn't have been active for a
long while.}) 6... d6 7. Nd5 $2 {
Almost forces Black to play a discovered attack tactic.} 7... Nxd5 $1 8. Qh5 $6
{Logical but not best.} (8. exd5 $1 8... Qxg5 (8... Na5 9. d3) 9. dxc6 Qh4 10.
Bd5) (8. Bxd5 $2 8... Qxg5) 8... h6 (8... Nf6 $1 9. Nxf7 Nxh5 10. Nxd8+ Kh8 11.
Nf7+ Rxf7 12. Bxf7 {with the same swap of two pieces for Rook and Pawn that is
likely to be better for Black.}) 9. Bxd5 $2 {This loses a piece.} (9. Nxf7 $1
9... Rxf7 10. Bxd5 10... Qf6 {with, guess what, two pieces for a Rook and pawn.
}) 9... hxg5 (9... Qxg5 $1 {is more forcing and safer} 10. Qxg5 (10. Qe2 Bg4
11. Qd3 11... Nd4 {and Black has a huge attack as well as a piece}) 10... hxg5
{and it's hard to see how Black can lose.}) 10. d3 10... g6 $4 {I think this
is the culprit - it weakens the King's-side for no good reason.  The move
creates two big holes on h6 and f6 - see move 13!} (10... Qd7 11. Bxg5 11...
Qg4 {forces a Queen swap.}) 11. Qh6? (11. Qxg6+ $1 {
White wins a pawn, but more important gets a winning attack.} 11... Kh8 12.
Qh5+ Kg7 13. Bxg5) 11... Be6 $2 (11... Qf6 $1 {
covers the weak dark squares, and so Black can defend.}) 12. Bxg5 12... Qe8 $2
(12... Bxd5 {Black must give up the Queen.}) 13. Bf6 $1 {
Black cannot put off being checkmated for long.} 13... Bxf2+ 14. Rxf2 Qe7 15.
Qg7# 1-0

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1181