Yet Another Story about George

I feel guilty.
George was all alone and sad after Gracie had to be put to sleep. We let him cry for 2 months before it became unbearable. We wanted him to know that we missed Grace as much as he did and that we weren't trying to replace her, but we also wanted him to have companionship. So in January we got him a friend.
Mobey had an upper respiratory infection when we picked him up from the shelter and we tried noticed significant improvement before he was fully integrated so we figured everything would be fine. But a few weeks later George started drooling and we found a cold-sore on his tongue. A few weeks after that, his eye started to ooze. Logic took him back to the vet to learn that he has herpes and needed to be on antibiotics.
Well, this last week he started coughing. We took him to the vet yet again and she said the cough wouldn't be related to the other symptoms and its possible that he might have asthma.
As a cat-mama I am stressed out. Would any of this happened if we hadn't brought Mobey home for him?
It makes me sad to write that. Mobey is a wonderful addition to our family and he and George are fast-friends. But I can't help feeling like it's my fault for bringing a sick kitty into the house and making my other cat sick because of it.
Poor Georgie.