tips for pvp match up

  (Edited: )

I just finished playing another toss. he owned me using very few units and decimated my army. I feel like i was beating him in macro till mid game and then it all went downhill from there. can some one please watch this replay and tell me if i lost because a mistimed attack, macro mishap, micro fail, or anything thanks :P)

here is the replay http://drop.sc/312024 im nin

P.S. I messaged him after the game to say gg ( i completely forgot before quitting)