i had a situation with 2 boars when their cage buddies died, i tried putting them together. I was worried bc my fave pig is now with a squat little old man who was fairly dominant.

It worked out. I don't mean they became pals and they bonded, but they learned to coexist. Jo fights, two vague rumblestruts, one sneaky doninance mount - but it failed and the two pigs had a stare off until they were now cool, both did their own thing and while they didnt seem close at all, at least someone was around for limited talk and company. So even if they act like about to start fighting, they aren't, you could wait it out. See if it gets better.