Depends, mine often grow up with a wether friend of the same age and share a pen, but once adults I normally remove the wether (freezer) and have billy on his own. I bring females to them to be mated one at a time, and several entire or wether boys to the "male" goat house usually. They can see each other but I have entire adult males of similar age not within butting distance from each other during the autumn/winter. They are normally fine in summer though.
I think once the boy has dealt with his girls he will settle down quite happily in a field next to them, maybe next summer leave a couple of wethers for him to keep him company? That's what I do with my sheep, once tup has done the job he goes back into his bachelor field. He will chase the wethers for a day or so, but I often have them running with the group during mating (to reduce number of field in use) as well and they do fine.