I once had a cat that would disappear regularly for weeks at a time. He would show up later just fine then gone again. Then one day while riding my bike around the nabour hood I spotted him at another house. I stopped to pick him up and the chick living there said WTF are you doing to my cat? I said your cat this is my cat! Turns out the little bastard had been living a double life. The chick said one day when she came home from work he just follwed her into the house and started living there. Couldn't blame him cause she was fine!