There are so many possible completely innocent reasons/explanations as to why there are variations in what you are hearing, probably the biggest of which is that he is very most likely not telling you everything because it really is his business and he probably doesn't think you care much for the details or need to know them anyway. It really doesn't sound like he's trying to be deceitful or hurt you in any way. Sounds like there is just more to the stories than you are privy to or can be privy to since in both cases another patient is involved. He can't give you all the details, right?