This is my first post, so please bear with me.
I have a 6 year old appy gelding(Kirby), I've had him for a 1 1/2 years but I have only ridden him 2 or 3 times because I'm scared of him. The first time I rode him after I purchased him he did fine until the very end, out of no where he bolted and bucked and of course I came off and got hurt fairly bad. Everytime someone had ridden him they came off... until I took him to a trainer where I had him there for 7 months. He never offered to do any of that for the trainer he is a pretty mover, does just about anything you ask of him easy and willing learner, ect ect. The day I picked him up the trainer said he was just going to ride, not lunge first just so we can see how he is, he did great for about 10 min, then he threw his fit.
We found out that he HAS to be lounged before riding him to get his "itchies" out. Both my sister and my brother-in-law have ridden him and he did fine, but they lounged him first.
So here's my question(s), does anyone have any suggestions as to get over my nervousness? I have a mare that I ride regularly and she gives me problems(like most mares can) and I have ridden quite a few other horses also trying to get my confidence up, and I have NO problem riding any other horse, it's just him.
My other question is, does anyone have any suggestions as to help him too. Like I said he does fine once you lounge him, but before that his back is curled up and he is just a big ball of nerves. (Owner and horse alike I guess

)
I would like to sell him, but I don't want to sell someone a dangerous horse. I don't have the time for him and he really deserves something better than just standing out in the pasture.If anyone has any suggestions, I would really appreciate it. Thanks!