Darius Rucker: "Most songs are about the one that got away or the one you want back or pining and whining. Here's a person that's content, but they heard that someone they loved at one time is getting married and reflected on it. When he says 'Don't think I don't think about it,' he's saying it to a buddy or to himself. He was fine until she got married." (Source Don't Think I Don't Think About It Songfacts).
I left out in a cloud of taillights and dust
Swore I wasn't coming back, said I'd had enough
Saw you in the rear view standing, fading from my life
But I wasn't turnin' 'round