sounds like Spike is the aggressor, Teddy is the picked on one and Bear is stuck in the middle.
It is a question of the safety of all the pigs.
My original boars (brothers) had a fight after they ate too much coriander (some herbs are like crack cocaine. Ours could eat parsley fine, but not coriander)
But even with their worst behaviour which involved the little boar getting his teeth into the brothers shoulderblades we side-by-sided them at night and put them out in the Pighouse by day (this was in their first winter with us )
They had space to get away from each other and tended to sleep seperate.
With the older boy and the younger cagemate, they dominance bonked rather than fight.
You could trial letting them socialise under supervision but read up on the signs of boar aggression (i'll try and find a link)
Otherwise if Teddy and Bear are happy together and not fighting, you might need to move Spike.
Most boar squabbles can be managed in pairs, but you've got three different personalities and their pecking order is probably unsettled.
But if they aren't happy together then removing one but making sure they can all interact vocally is at least keeping them safe.
Boars don't tend to cuddle up. Boars in groups is not a natural state for them but it's a system that can work if managed.
I've kept a neutered boy and 2 sows which worked well (no squabbling but he did try it on with them 
). They'd much prefer 1 boar + lots of sows