More info would help. Background on this horse , on your level of experience, what you have done so far to try to deal with this, his health, his tack , your type of riding.
Horses don't usually threaten without having a reason, even though we might not see that as a 'reason', nor can we allow it, no matter how good their reason. But, sometimes knowing the reason can help us help THEM to get past whatever is making them feel so bad that they want to bite or kick us, but don't carry through with it.
Whatever you do, please do something and not just allow it to continue on, in this 'stuck' place where you are making each other miserable..
if you have video of your interaction with him, this would be good to view.