The exit was strange, if indeed it is a months break, and I'm not so sure it is. If he is to comeback doesn't it just make a mockery of the character even further?
It would have been better to give him some reason to go off and not just some rushed exit as this seemed, I mean he didn't even say goodbye properly! Its as though nobody really cares for him that he left, why would anyone come back under those circumstances?
I found out that his family have recently started running a casting agency for young kids, fronted by his Mother and friend and I believe Jamie has part funded this from what info I've read. Could this be that he's aware his future on the show is in doubt and is perhaps finding other sources of income and using his reputation as an actor to enhance the business should he be axed from the show?