The author only answers with what amounts to "feeling it's time to move on". As much as I respect his courage to make the decision, you can never "know" which

The author only answers with what amounts to "feeling it's time to move on". As much as I respect his courage to make the decision, you can never "know" which road is best - just ask Robert Frost. But I've always taken his poem to mean that you need to make the best of the road you choose - and if you're consistently unhappy, perhaps it's time to take the proverbial "other fork".