[Newpiggiemom]

Your situation sounds so much like mine. I had almost the exact thing happen with my 3 boys. My Jack wound up with an abscess from being bitten on his side. Chester was bitten on his face and looked bad for a while. I felt horrible and cried and my children cried. It was such a disappointment. Needless to say, I had to separate them. They are now in a divided cage but it seems to be working. I am reluctant to ever re-introduce them for fear of something terrible happening.
Don't beat yourself up--you couldn't have known what would happen. We try our best but it doesn't always work out.
My Spike seems to be happy to be able to see and talk to the other boys. Maybe keeping a divided cage will work out. It has for me so far even though it was not what I had originally wanted.
If I were you I would think long and hard before getting another. What if it doesn't get along and then you need 3 separate cages? That has been my fear. So my boys will live with their divided cage and socialize safely through the bars.
It does get a little easier once you get used to it.