1st stanza: Traveler knows he is presented with a choice and wants to travel both but is forced to travel only one
2nd stanza: The choices are different but it's impossible to tell which is better
3rd stanza: Traveler forced to make choice between equally good choices
4th stanza: Traveler predicts the choice he made will greatly shape his future. The sigh also suggests he will feel uneasy about his choice.