Congratulations on your redecorating of your bedroom. The color combo sounds beautiful, soft and relaxing. I'm sure you are thrilled with the redo and now...you'll be thinking of doing other rooms in the future. I'm very happy that you did this.
I like Andrew's suggestion on having your dad, mom or a friend be there when he comes over to continue to sort stuff. You may even want to go through the boxes w/your daughter before he comes over and take what you want to keep and repack it new boxes and label them as yours. That way, you do not need to be around him when he sorts what he wants and or doesn't want.
BTW, yes, your h is very clueless. He doesn't understand why you would want him to sort stuff and remove his belongings. I also agree w/Andrew that if things had any real meaning for him, he would have taken them or come back for them along the way...so, yeah, it's time to take all of that stuff and I would venture to guess that it will remain boxed up at his place until he moves and then he may very well toss or donate the stuff. It's all part of his past, a past that he really doesn't want to be bothered w/while in crisis.
I think you handled this situation beautifully!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.