I have a Russian Blue cat that has been running away lately. He is an indoor cat 97% of the time. We ran away for three weeks and was starving. I found him in a storm drain. He has since been home for two weeks and has been grounded from going outside. He got out again last night, but we didn't see him rush the door. He is now missing again. I am starting to wonder if he is ill or has mental problems? Why would he want to go out into the cold world where there is no cat food, no warm beds, and no one to pet him. He has been fixed. So I don't think he is outside looking for female cats.