I too, would like to commend you Darla! I can't offer much advice on working with an abused horse, but I want to say that it is so wonderful that there's people like you out there. I agree with the people that have advised you to take your time with him, but also show him that you are a leader. He'll soon learn you are a human to be trusted.
As much as we wish our horses could read our minds, our hearts, and accept the type of love we love to shower them with, some horses don't like hugs, or being groomed for an hour. My first horse that was with me for a very long time(17 years) never came to me when called or liked being brushed but he took good care of me on the trail. My new horse (of only 4 weeks) however will walk away from hay to come greet me at the gate, whether I have a treat or the halter in my hand.
You're on the right track. No two people are the same and no two horses are the same! You both will figure it out. Good luck to you and be safe!