i understand you're in a hard situation but the fact is unfortunately that he will die if you do not initiate the suggestions we have given immediately. i am not judging you in any way. however there is no other solution besides separating them and a vet visit. the risk of death in his current situation is rather high, he is highly stressed, not eating. has physical issues with his well being and is probably advancing in stages of infection. He would be considered to be in very poor health right now.