It's really not a surprise that he acts that way about the saddle, consider that the last times he had the saddle on him he was in a whole lot of pain and it puts his behavior into perspective.

You're going to have to start with the basics again with him and reteach him that the saddle won't hurt him. This will also help build the trust back up between you.

Get a really good book and/or videos on starting young horses and treat him like a 2 year old that's never been saddled...go from there. It will make a world of difference!
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PH Cody
HorseHobbyist Site Coordinator