have a 2.5 yr old male cat who is very placid but nervous of loud noises etc. We got a kitten 4 wks ago and she is annoying him so much. She won't leave him, jumping on his back and trying to play. She ignores all his warning (growling, cuffing her) and continues. I'm worried that she's making him unhappy and how to deal with it. I shut her out of the kitchen so he can eat in peace. Now she is displaying agression back to him, ears back etc. How long will this last? or do some cats never get on?