I am worried that my cat Sebastian may be depressed. Previously, Sebastian was the most affectionate and demanding cat I've ever met. He would jump into your lap the instant you sat down, and constantly demanded more attention by crying all the time. He was actually pretty annoying. However, for the last few weeks, he has become very withdrawn. He spends all day sleeping in his chair with his back to me. He does not respond when I talk to him, and only lifts his head a bit when I pet him. He has stopped talking almost entirely. I am getting worried about him. Some background: I have 2 cats, Sebastian, 4 years, and and Aragorn, 1.5 years. Both cats are indoor cats, but they occasionally get to go outside on a leash. They eat PetsMart Authority Hairball Control Light cat food, with occasional treats of tuna. We have had Sebastian for about a year and a half, he was adopted from my vets office. While we have had him, he has had no health problems other than lots of hairballs (both cats have long hair, and neither likes to be brushed). The only recent changes have to been to the work schedule. My fiance currently works about 60 hours a week, usually 3-11, and I work 30 hours plus summer school, so I am gone from 8-5 every day. In the past, it was always Aragorn who had problems with the schedule adjustments, and Sebastian acted as if he couldn't care less. Now it is almost the opposite. My fiance is blaming himself for Sebastian's depression, because apparently Sebastian tries to cuddle with him while my fiance is busy trying to get ready for work, and so is sometimes brushed off. I make a point to give both cats attention as soon as I come home, and every time I happen to walk past them. While Aragorn actively seeks me out, Sebastian never leaves his chair expect to eat or use the litterbox. In the past he would always at least perk up and talk to me if I called him, if not outright come over. Now he doesn't even move. Either he is depressed or deaf. I'm not sure which. Sorry thise is so long, but I am getting worried. Any advice would be greatly appreciated.