What Causes Confusion And Poor Memory?

My husband is having some troubles where he doesn t remember someone saying a statement to him and then he repeats what that person said back to them. Or when you are talking to him he says the exactly the opposite of what he meant to day. This is really starting to bother him. At first we thought that it was just from overwork and being to preoccupied by other things. But he has decided to try and focus on one thing at a time and it is still happening. Any help would be appreciated.