I personally wouldn't jump right to it isn't workin out=sell
I would do Join Up by Monty Roberts-look up it iwll explain awhole llot better than me!!!!!!
I would hang with him, no hard work, jsut trail ride, mess around with him, play some horse soccer, and I have a secret to tell you. I do a conversation with me horse. Some say, "that's normal." No, I do a full out conversation, their ears tell me what they think, (they mostly agree with me ^^) I always talk with my horse, on the ground or in the saddle. Don't give up on him just yet, sometimes it takes a little bit to break the ice