I respectfully disagree right back atcha. The fact that he says she "ran" (rather than saying "don't know why you're gone") suggests he is pretty sure she left of her own accord. His speculation centers entirely around something "going wrong" in their relationship, and he wants to find out what it is and fix it if possible... there is nothing in the song to suggest he is worried she might be in danger. Most tellingly, he does not call the police but instead engages in a one-man search on foot and via hitchiking. If a person has a missing loved one and believes they might be in imminent danger, is there any plausible reason they wouldn't call the police? I can buy the argument that you can interpret the song more romantically and more sympathetically to the narrator than I've been doing, but I don't think there's a plausible argument that he's worried she's in danger. He's clearly not. At any rate, I don't want to beat this into the ground. I thought it was an interesting point about the lyrics that Dave brought up, and I agreed with it. But I respect you guys' opinions that disagree with me. A good lyric can be open to differing interpretations.