I think that Harold didn't want to acknowledge or see how deep Amy's depression was because she had always been his "Golden Child" and he expected that she would just "snap out of it" eventually. Depression isn't something that you can just "snap out of" though, and this show, and Emily, really illustrated that perfectly in Season Two. Rose saw the situation much more clearly than Harold did in this episode, to the point where she confronted him about how serious the situation with Amy was, but he refused to acknowledge that Amy's depression and listlessness went way beyond simple grief over Colin's death.