He normally doesn't act like this with the filming. This is out of the ordinary. I don't know if it is because he is conflicted or looking for an excuse to divorce me.
Normally I would say there is very likely an affair that you don't know about yet. But I really think in his case the "affair" is the new relationship with his mother. I don't think it's sexual but I think he's following all the typical affair patterns because he has this "new woman" in his life. He's become infatuated with her. I've got to say, it really, REALLY struck me odd that he said he was leaving you to move in with her.