Look out for the man retreating to his cave! Sometimes men want to have some space to figure out problem-solving by themselves. It's the old "Map? I don't need a map! I know where I'm going!" syndrome.
I'm sure he appreciates your offer to help but the key is not to appear to be pushing too hard (like reminding him that you are a "team" and making him feel guilty because of the walls being raised). That could, in and of itself, build a bigger wall around the "cave." Sometimes guys can be stubborn and they want to do things on their own. It's important for women to find the proper balance between being involved and being viewed (correctly or incorrectly) as nagging.
You offered to help. Leave it at that. I don't think this is bad unless it becomes a constant habit. Then, it could sour things up.
