Needed to separate bonded pair- worried about Depression

Hello!
My three year old bonded pair of males needs to be deprecated. The larger male named Spock has started to violently attack our other chinchilla Kirk . It was so bad that Kirk managed up escape the cage. I have no idea how. Nothing was open. I’m worried he literally shoved himself between the bars to escape.
Anyway, Kirk has always been super affectionate with his brother. I’m worried that since I need to now separate them, Kirk will be lonely and acquire depression. Should I get and...

Needed to separate bonded pair- worried about Depression