First of all you played a strong game, and you had the advantage in the begining with whites weak pawn structure. You basiclly made 1 or 2 wrong moves against a strong player.

better than what i could have done againsed that guy.

I agree you played a strong game, maybe you should have attacked a little more then you did. I say that only because I play better when I attack and keep the pressure up. Nice game

My question is why did'nt you take his knight on your 13th move!

Up to 21.e4 Blacks position is nice, the white bishop is quite bad.

Maybe 21.-g5!? with the idea of f5 to follow

 The position started to get worse from the very moment, when the white

centerpawns became mobile! 

Youn were driving his white bishop an the attacking diagonal and then you opened

it for him. Knf4 is already a mistake! 

You did not anticipate tactics. Remember how you lost your knight - in the second game? Then there was the point where you had to resign because you would have lost your rook through a discovered check?  Anticipate tactics! Otherwise, technically you are a good player who did well, even though you were heavily out-graded!

Yeah I agree, you seem to have a good grasp of position play, but tactics is an issue. I think you have, nevertheless, played excellently against really strong opponents.