Why can't my husband ever say he is sorry?

My husband never says he is sorry for anything. I believe it is because he never thinks he is ever wrong. Instead, it is always my fault. For example, while helping him with some wood, the lumber toppled over on my feet. I yelled "ouch". A normal person would have said, "Oh, I'm sorry! Are you OK?" Instead he said "That's what you get for standing right there." making it my fault, not his. When I say I'm sorry to him, he says "No you're not. You're not sorry at all." I once said to him "I'm sorry if I ever did anything to hurt you." I expected him to say "And I'm sorry if I have ever done anything to hurt you." Afterall, that's what a normal person would have said. He didn't say that at all. He said that there wasn't a need for me to apologize for anything. I really feel that is how he feels about hurting me, that he just doesn't need to say I'm sorry, but you know what? He does.