Weeeell [member=204037]Trix[/member] .....I'm sorry to say that the pair of you have made him that way. Male sheep, castrated or not, are not appropriate as pets. Sheep are not humans and they do not have human emotions of gratitude and duty. Sheep are sheep and have only the life behaviours needed to be a successful sheep. Just because a male has been castrated does not mean that he has no male characteristics, which includes dominating the females and many of the males of the flock, and maintaining his position by fighting. Your wether accepts you as flock leader, but your wife is a female (all animals are embarrassingly aware of the sex of humans) and now he has achieved adulthood he will fight to keep her in her place, which so far is below him in the pecking, or bashing, order.
She is very sensible to keep out of his way until there is a solution. I so, so wish that it was never recommended to new keepers to start their sheep ownership with 'bottle babies' - just that title shows they are not going to be treated as sheep. They become pets, are cute and loving to have around (they like to be fed) but all too soon they turn into big, smelly, rambunctious adults which still think they are cute and can get away with the behaviour they exhibited before.
The only answer is to make the decision to send this sheep off for meat. You must not pass him on to another keeper as you are dumping your problem on someone else who could become injured. It's a horrible decision to have to take and you will learn a life lesson from it, but do it before your wife is seriously injured. Understand too that he will move on to fighting with you soon as well.
The only answer for bottle lambs is to feed them on an automatic feeder so 'humans' do not equate with 'sheep'
By the by, it's not that he doesn't 'like' your wife, it's that he likes her all too much and wants her in his harem