I am sorry the little one fractured his arm. My S when he was 10 went down a hill, over a bike ramp, and flipped over the handle bars of his bike, and landed on both arms and broke them both, and had casts on both arms up to his shoulders. He was being so brave, I didn't think even one was broken at first. After 3 hours at his doctor, who sent him to the emergency room, and seven hours there, and being pumped full of drugs, and only wimpering when they kept sticking his foot to find a vein, it was on the way home, when we got him something to eat, and he was trying to feed himself and dropped it and he started crying, because he couldn't eat. We had to do everything for him, from the bathroom, to feeding him, bathing him, like he was a baby. Oh, and he still went to school, only missed one or two days.
But I probably shouldn't tell you that, you might cringe at what little boys who jump on beds may do when they are ten years old.!!! But, he did "retire" the bike ramp.
He sounds like he has anxiety built up so much in his mind, that he's scared of doing it. Like maybe he is afraid after all this, you may reject him, or it won't be the same at first. Sometimes, I wonder if my H and I jumped back into it too soon, but it was a 180 for me to never reject him, so I felt I needed to. Maybe it will just be spontaneous one day, and he will just grab ya!! I know it hurts you, but you are strong, you can make it.