Help! i'm scared to canter again?

sometime in January, I can't remember when, my horse and I were schooling in the ring. He decided a few strides into the canter to go all bucking bronco on me. I was safely still on his back, but pissed off that he would do that. I had my friend ride him the next day and he did the same thing to her. I was concerned maybe he was lame, but no signs of any pain, inflamation or anything. So I decided to lay off canter work for a while. That is what I have been doing, but I desperatly just want to canter again, but I'm scared. And I don't want my nervousness to carry through to my riding because he will feel it right at that crucial time when I ask for the canter. How can I overcome my fear, but at the same time start cantering again, I miss it so much! Thanks for your answers, please no rude comments