We are all just guessing here about why he's acting odd. For all I know, he's feeling insecure and guilty because he's been getting another case of restlessness or actually has done something (OW-related?) that he feels guilty about.
I'm choosing not to interpret things in the worst light. Who knows though? There's still plenty of alien in his behavior sometimes and has a loooong history of being secretive.
I just wish he'd talk to me instead of weirding himself out. I hate having to ask what is wrong and get the same old "nothing is wrong" or "I'm fine" answer when that obviously isn't the case.