[Pebbles82]

Once they're separated they do need to stay separated. Some very experienced breeders have sometimes managed to reintroduce a pair, but it is a rare thing and very risky. The next fight could be really nasty? They can be seriously maimed or killed.

Don't blame yourself - this is very common, even with the cage set up right - especially when they get to a certain age and their hormones kick in. They will be fine living alone as Cypher says. On the plus side they sometimes bond more with the owner when living alone.