New Kid in Town Lyrics Meaning

As I was listening to it, I thought it may be about a man who had to leave his girlfriend due to deployment. He seems to be worried that During his absence the distance will make her heart grow weak. Now, it sounds as though he has heard some rumors about her spending a lot of time with some guy who just moved into town. I think he's referring to himself as the "johnny come lately," for when he returns she'll already have moved on; even if he returns from the military a changed and new man- a"new kid" of sorts in town, that other new kid had moved in on his girl, and he was gone just too long to have prevented it