So sorry Becky. This sounds intentional. He's trying to portray to the powers that be that he is the nice guy trying to help you out. He either wants something (like the kudos you get for a good job OR your job) or he simply doesn't like you or he gets a buzz from manipulation. If I were the boss I would see right through it, but not all bosses do, especially men.
Document everything and everywhere you are through out the day. It will become an issue at some point. Mention to other co-workers when you are stepping away from your desk. "I'm going to personnel, I'll be back in 10 minutes." Then say hello to the person you told and document when you get back. You need back up. I wouldn't express this to anyone, except maybe your boss when you feel it's appropriate, because someone may get the impression you are trying the same tactics on him. I've been there. I did the corporate world for 20 years and there is always someone like this lurking. I'm sure most folks think he's a nice guy too.
Do the best you can and hopefully he'll trip over his own lie.....
M.