Basically without watching the game, my feeling is that the threes he chucked he was open on those but missed most of those. Since he was open when he took the shot, it's more likely he got the offensive rebound and kicked it out for another three and hit most of those.
The fact that you hit 75 percent says he played no defense and he might have caught you in the wrong defense because he was open alot.
In any case, my recommendation is always to first look at what you can do. The first thing I suggest is to slow the game down. You basically played his game and he won imo.