I'll try to explain why you lost. First, he had 3 players score 20+ pts, while you only had 1. He also made 4 more threes, but he took almost twice as many as you. Secondly, he committed 7 fewer fouls and made 10 more FTs.
One more thing might be that his 2-3 zone stopped your bigs. I don't know if it was his OD, ID/SB, or both. For the most part, you had better GS.
I don't know besides what I've just typed. Sorry for your loss, man, and I know I've had stuff like this happen to me in the playoffs.