When you say he is "so mean" - what, exactly, is going on? Is it a matter of him over-mating her (expected with a 1:1 ratio) or is he actively aggressive? If it's a matter of aggression, is it also a matter of him being human aggressive? While living solo is not optimal, depending on what is actually happening between them, I would consider it preferable to living with an abusive partner.
He would stalk me around the yard no matter how far away I was. The second I turned my back I could here him thumping up behind me like a herd of rhinos. The one we have now is a complete saint compared to Chomper (rightfully named haha)
and Welcome To BYC!