It sounds as if you are asking a couple of different
questions... so let me answer them separately.
1. His dislike of a particular female... This
happens and I don't think anyone except the male
knows why. It could be an odor or a color or maybe
she doesn't like him and is sending some sort of
subliminal something.... nasty looks. You didn't
indicate if this female has been bred. Has he
already bred her or was she bred by a different
Putting bred females in with a male that isn't the
service sire is not a good idea. Some males will
not take no for an answer unless they are the male
that bred the female and will either breed the
female by force or chase her unmercifully. If he
does breed her on the sly you won't know who the
sire is until you get the results of a blood test.
2. Males living alone...When possible I think it is
better for a male to live with others; either a
female harem (females that have been bred to him), a
bachelor herd or a buddy. It is not a great idea to
try introducing an aggressive adult male and a very
young male. If there is a big disparity in size the
younger smaller animal could get hurt.
You might try getting a big stout gelding alpaca, or
perhaps a gelded llama as a pal. These animals have
many uses and are worth having around they can be
used not only as pals for breeding males but also
as: buddies for quarantined animals, or animals that
have to go away to be bred or to the hospital,
guardians for the females and their babies when the
babies are young.
If you have enough property keeping males away from
females will help them get along better.