thanks for all this advice, but we figured out our problem! He wasn't comfortable with me riding him because he was unsure if he was safe with what I was telling him to do. (THANK YOU TO MY TRAINER). So to fix it, I had to spend a lot of time with him on the ground before I got on. Grooming him, leading him and then finally leading him around the ring at the walk and trot. When I got on, I talked to him and he moved off my leg.
To answer the questions:
-ive had him for one month and this has never happened before. I rode bymeyself when I tried him, and he was very responsive.
-he did this with loose rein, dropped reins, different bits, halter and lead rope, bareback and bridle less.
-i have been riding for 6 years, I'm comfortable walk trot canter jump(up to 3'6) and I don't have lots of experience riding green horses, but I've ridden them before. If a schoolmaster is a push button pony, I've never ridden one of them. Mostly I rode really lazy horses and the occasional crazy guy.
But thank you SOO much for trying to help with prince and I. It was really helpful!