Okay, I think everybody here knows the answer, i.e. the lyrics to all three are written from the perspective of a guy who wants a girl who's going with somebody else.
I should add that I'd never seen either the Springfield or Cars live videos before, both of which are a lot of fun.
I should also add (and I've said it before in these precincts) that some day a smart country band or artist is going to do a remake of "My Best Friend's Girl" and have a huge hit with it. I mean, Keith Urban could absolutely kill on that.