When we got Magic we were told she had been riden a few times. She was used to the saddle/bit and was not totally new to being riden. So after a few months of groundwork, I decided to saddle her up and ride. I rode her maybe five times. I rode her bareback once, and the other times with a saddle. She responded to my requests great. She walked/trotted when I asked, responded to the bit, backed up, and bended. My fiance got on her the first time and she immediatly was aggitated and she bucked him off. I then got on her and rode her; She was just perfect. He got on her another day, she did the same thing. He gets on and she immediatly stops listening to him. She wouldn't go, then when he did get her to move she bolted and bucked him off again.
I don't know why she does this. The second time she bucked my fiance off, I got a little worried. Any ideas to why she does this? I thought maybe it could be because she has no respect for my fiance? Any ideas would be much appreciated.