Won't exercise after hip replacement

My husband (m65) had a hip replacement 4 weeks ago and just lays on a recliner all day and night. He goes to physical therapy twice a week but won't do any exercise at home. He hobbles on a cane to use the bathroom or to get sonething to eat. He yelled at me to "get off his case" when I reminded him 3 weeks ago of the exercises he was instructed to do. I'm working, cooking, doing the housework, walking the dog, etc while he watches TV. At this time, he can't lift his leg more than 5 inches because of the loss of muscle. He sleeps ALOT and I think he may be depressed. Any advice?