What's his exercise routine like? Has it changed at all since this new person entered your life?
While I think that dogs feel basic emotions, including jealousy, to me this sounds more like a response to a change in his day to day routine. There's a new person here that wasn't here before, that's got to be exciting for Barley! I would up the exercise and go back to NILF. Get your new guy in on the training so that everyone is on the same page. Barley is still very much a puppy at 2 years old.